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单选题
A butterfly valve consists basically of a disc pivoted across the bore of a ring body having the same radial dimensions as the pipe in which it is fitted.According to the above sentence, which of the following statements is not true?（）
A
The diameter of a disc is the same as the outer diameter of the pipe
B
We can infer that the valve is opened or closed by rotating the spindle
C
A butterfly valve comprises a disc and a ring body
D
The profile of the butterfly valve is a ring body
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更多 “单选题A butterfly valve consists basically of a disc pivoted across the bore of a ring body having the same radial dimensions as the pipe in which it is fitted.According to the above sentence, which of the following statements is not true?（）A The diameter of a disc is the same as the outer diameter of the pipeB We can infer that the valve is opened or closed by rotating the spindleC A butterfly valve comprises a disc and a ring bodyD The profile of the butterfly valve is a ring body” 相关考题
考题
Any protection scheme consists basically of _____.
A、two elementsB、three elementsC、four elementsD、five elements
考题
【GSM协议与标准】挂机之后A接口资源清除的顺序为(拆线－DISC,清除BSS资源－CLEAR,释放－REL):()
A.DISC-REL-CLEARB.REL-DISC-CLEARC.CLEAR-REL-DISCD.CLEAR-DISC-REL
考题
The globe valve has a bulbous body, housing a valve seat and screw down plug or disc arranged at right angles to the axis of the pipeAccording to the above sentence, which of the following statements is not true?A.The profile of the valve is like a globeB.The valve seat is set into the bulbous bodyC.The plug or disc of the valve is made vertical to the axis of the pipeD.The valve seat is located at right side of the plug or disc
考题
_______can cause oil flow from water outlet of the oil purifier.A.Oil inlet valve opening too quicklyB.Oil temperature little higher than normalC.Diameter of gravity disc too smallD.Viscosity of oil little lower than normal
考题
● Basically, a computer consists of five components: (71)， memory, storage, input device and output device.(71)A.keyboardB.mouseC.monitorD.CPU
考题
The valve on the discharge side of a cargo pump on a tank vessel will usually be a ______.A.butterfly valveB.spectacle valveC.check valveD.globe valve
考题
In the piping systems of a vessel，what type of valve gives the least resistance to fluid flow when fully open ________．A.Globe valveB.Butterfly valveC.Gate valveD.Packless valve
考题
What is an advantage of a gate valve over a butterfly valve ________．A.Less frequent maintenanceB.Faster operationC.CheaperD.More compact
考题
One day a man found a cocoon （茧） of a butterfly in the forest. He sat there for several
hours and watched the butterfly. Suddenly a small opening appeared, and the butterfly made its great effort to force its body through that little hole. Then it seemed to stop making any progress. It appeared as if it had gotten as far as it could and it could go no further.
So the man decided to help the butterfly. He cut off the remaining bit of the cocoon so that the butterfly could come our easily. But to his surprise, the butterfly got a heavy body and very small wings when it came out of the cocoon.
The man continued to watch the butterfly because he expected that the body would grow smaller at any moment and the wings would become larger and be able to fly. But neither happened! In fact, the butterfly spent the rest of its life crawling （爬） around with a heavy body and small wings. It was never able to fly.
The man was in his kindness, but he did not understand the nature rules.
Before the butterfly came out of the cocoon, fluid （流体） from its body must be forced into its wings, and then it would be ready for flying. It must have a hard struggle （拼搏） to get through the small opening to get its freedom from the cocoon.
Sometimes struggles are exactly what we need in our life. If God allowed us to go through our life without any difficulties, it would make us fail. We would not be as strong as we could have been; we could never fly.
The man cut off the remaining bit of the cocoon ____.
A. to take the butterfly home
B. to help the butterfly come out easily
C. to kill the butterfly
D. to stop the butterfly growing bigger
考题
One day a man found a cocoon （茧） of a butterfly in the forest. He sat there for several
hours and watched the butterfly. Suddenly a small opening appeared, and the butterfly made its great effort to force its body through that little hole. Then it seemed to stop making any progress. It appeared as if it had gotten as far as it could and it could go no further.
So the man decided to help the butterfly. He cut off the remaining bit of the cocoon so that the butterfly could come our easily. But to his surprise, the butterfly got a heavy body and very small wings when it came out of the cocoon.
The man continued to watch the butterfly because he expected that the body would grow smaller at any moment and the wings would become larger and be able to fly. But neither happened! In fact, the butterfly spent the rest of its life crawling （爬） around with a heavy body and small wings. It was never able to fly.
The man was in his kindness, but he did not understand the nature rules.
Before the butterfly came out of the cocoon, fluid （流体） from its body must be forced into its wings, and then it would be ready for flying. It must have a hard struggle （拼搏） to get through the small opening to get its freedom from the cocoon.
Sometimes struggles are exactly what we need in our life. If God allowed us to go through our life without any difficulties, it would make us fail. We would not be as strong as we could have been; we could never fly.
What do you think of the man?
A. Patient but cruel.
B. Careful and wise.
C. Kind but unwise.
D. Brave and funny.
考题
One day a man found a cocoon （茧） of a butterfly in the forest. He sat there for several
hours and watched the butterfly. Suddenly a small opening appeared, and the butterfly made its great effort to force its body through that little hole. Then it seemed to stop making any progress. It appeared as if it had gotten as far as it could and it could go no further.
So the man decided to help the butterfly. He cut off the remaining bit of the cocoon so that the butterfly could come our easily. But to his surprise, the butterfly got a heavy body and very small wings when it came out of the cocoon.
The man continued to watch the butterfly because he expected that the body would grow smaller at any moment and the wings would become larger and be able to fly. But neither happened! In fact, the butterfly spent the rest of its life crawling （爬） around with a heavy body and small wings. It was never able to fly.
The man was in his kindness, but he did not understand the nature rules.
Before the butterfly came out of the cocoon, fluid （流体） from its body must be forced into its wings, and then it would be ready for flying. It must have a hard struggle （拼搏） to get through the small opening to get its freedom from the cocoon.
Sometimes struggles are exactly what we need in our life. If God allowed us to go through our life without any difficulties, it would make us fail. We would not be as strong as we could have been; we could never fly.
What was the butterfly doing at the beginning of the story?
A. It was trying to make a cocoon for itself.
B. It was struggling to get out of its cocoon.
C. It was flying among the trees in the forest.
D. It was crawling around quietly on the ground.
考题
【GSM协议与标准】挂机之后A接口资源清除的顺序为（拆线－DISC，清除BSS资源－CLEAR，释放－REL）：（）A、DISC-REL-CLEARB、REL-DISC-CLEARC、CLEAR-REL-DISCD、CLEAR-DISC-REL
考题
单选题Which one of following statement is not true concerning the suitable sites of the direct acting relief valve and the pilot operated relieve valve?（）A
the direct acting relief valve is used for controlling lower flows and pressureB
the pilot operated relief valve is used for controlling higher flows and pressureC
the pilot operated relief valve is used for controlling lower flows and pressureD
the controlling accuracy of direct acting relief valve is worse than that of the pilot operated relief valve
考题
单选题Which of the following statements concerning butterfly valves is correct?（）A
Special tools are required for lapping or grindingB
It is impossible to throttle flow with a butterfly valveC
To close the valve, it is only necessary to turn the handle a quarter of a turnD
The butterfly valve should never be used in a freshwater system
考题
单选题The （） of the gravity disc is too big It causes oil to flow through the water outletWe changed the disc and no oil is found in the water outlet.A
gravityB
diameterC
circumferenceD
cylinder
考题
单选题Basically the bedplate consists of two （）, which run the length of the engine.A
longitudinal girdersB
transverse girdersC
fore girdersD
aft girders
考题
单选题（）can cause oil flow from water outlet of a separator.A
Oil inlet valve opening too quicklyB
Oil temperature too highC
Diameter of gravity disc too smallD
Viscosity of oil too low
考题
单选题The diameter of the gravity disc is too big It causes oil to flow through the water outlet We changed the disc and no （） is found in the water outlet.A
waterB
oilC
scaleD
ridge
考题
单选题Valve lash, or clearance refers to the （）A
clearance between the top of the valve stem and the rocker armB
compression of the valve springsC
clearance between the valve seat inserts and the headD
out of roundness of the fuel injection cams
考题
单选题To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the （）A
suction service valve as a vaporB
suction service valve as a liquidC
discharge service valve as a vaporD
charging valve as a liquid
考题
单选题【GSM协议与标准】挂机之后A接口资源清除的顺序为（拆线－DISC，清除BSS资源－CLEAR，释放－REL）：（）A
DISC-REL-CLEARB
REL-DISC-CLEARC
CLEAR-REL-DISCD
CLEAR-DISC-REL
考题
单选题Cocks and valves control or interrupt flow, and have internal passages arranged so that they can be restricted or closed: in cocks, by rotating the plug, and in valves, by lowering, raising or rotating a disc in relation to a seating surfaceAccording to the above sentence, which of the following statements is not true?（）A
Flows of fluids can be restricted by both cocks and valvesB
There are seats in the internal passages of valvesC
A disc of valve only moves up and downD
We can infer that there is a bore in cock ping
考题
单选题Valve cages are used on some large diesel engines to （）A
reduce wear on the valve stemB
permit the use of alloy valve seat materialsC
reduce heat transfer from the valve seatD
facilitate valve removal for servicing
考题
单选题The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by（）A
governor flyweight action on a pilot valve which controls fuel injectionB
governor flyweight motion acting on fuel controls through suitable linkageC
positioning a butterfly valve in the fuel delivery system positioningD
a servomotor piston attached to the fuel controls
考题
单选题A simple pumping system consists of a suction branch, a pump and （）.A
a priming deviceB
a discharge branchC
a filterD
a suction valve
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