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单选题
Which of the following statements is correct concerning the “flash point ” of a liquid?（）
A
It is lower than the ignition temperature
B
It is the temperature at which a substance will spontaneously ignite
C
It is the temperature at which a substance, when ignited, will continue to bum
D
It is the temperature at which the released vapors will fall within the explosive range
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更多 “单选题Which of the following statements is correct concerning the “flash point ” of a liquid?（）A It is lower than the ignition temperatureB It is the temperature at which a substance will spontaneously igniteC It is the temperature at which a substance, when ignited, will continue to bumD It is the temperature at which the released vapors will fall within the explosive range” 相关考题
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According to the passage, which of the following statements is correct?A．A "revocable credit" may be cancelled at any time.B．The credits are usually in favor of the exporter.C．An "irrevocable credit" may not be amended.D．The credits are usually in favor of the importer.
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Which two statements are correct concerning DHCP Internal Server in the E－series router?()
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In HDLC Protocol, when Supervisory Frame's type code is '00'.About the following statements, which is correct.A．Receive ReadyB．Receive not ReadyC．RejectD．Selective Reject
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Which of the following statements concerning intellectual property is wrong？（）A、Intellectual property is an intangible creationB、Intellectual property in ludes patents，trademarks，copyrights，etc.C、Intellectual property is a visible creationD、There are some agreement sconcerning intellectual property under the WTO
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单选题Which of the following statements concerning energy is correct?（）A
Energy can be created or destroyedB
Energy may not be transformedC
The total quantity of energy in the universe is always the sameD
None of the above
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多选题Concerning the figure below, if a =b, which of the following statements must be true? (Indicate all such statements.)Ac=dBl and k are parallelCm and l are perpendicular
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单选题Which of the following statements concerning cargo is correct?（）A
Cargoes are any type of goods transported by any type of shipsB
Cargoes are goods transported in bulkC
Cargoes usually include goods transported in bulk and in containersD
Cargoes are usually packaged in containers
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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
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单选题Which of the statements listed concerning heat transfer is correct?（）A
Heat is always transferred at a constant rateB
Heat transfer rate increases as temperature difference increasesC
The rate of heat transfer is not affected by temperature differenceD
The high temperature region is known as a heat sink
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单选题Which of the following statements is correct concerning heat transfer?（）A
Heat is given off from a high temperature region known as a heat sinkB
Heat transfer rate is affected most by the size of the heat sink involvedC
Heat transfer rate is affected most by the temperature difference between the heat source and the heat sinkD
Heat transfer by radiation will occur only by mass motion of a fluid substance
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单选题Which of the following statements is true concerning centrifugal pumps?（）A
They are particularly suited for pumping high viscosity fluidsB
They are started with the discharge valve openedC
The flow of liquid is developed by imparting energy due to the rotation of an impellerD
They are always mounted in a horizontal position
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单选题Which of the following statements is true concerning any evaporator?（）A
High conductivity of the distillate indicates distillate salinity is excessiveB
Increasing the absolute pressure of the shell will increase the distillers capacityC
Mesh separators are used in evaporators to filter the distillateD
Reducing the brine density will reduce the heat lost overboard
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单选题Which of the following statements is correct concerning a typical shipboard multi-coil refrigeration system?（）A
The liquid receiver functions to collect and remove non-condensable gasesB
A thermostatic expansion valve is used to control refrigerated space temperatureC
Refrigerant temperature in an evaporator is directly related to refrigerant pressureD
Dehydrators must be used continuously in a refrigeration system
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Intellectual property is a visible creationD
There are some agreement sconcerning intellectual property under the WTO
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单选题Which of the following statements concerning fire-tube boilers is correct?（）A
Combustion gases flow through the tubesB
Flames impinge on the tubesC
Combustion occurs in the tubesD
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单选题Which of the following statements is true concerning the cetane number of diesel fuel?（）A
The cetane number affects the amount of injection lagB
The cetane number is an indication of the fuels viscosityC
Ignition lag is reduced with fuels having a high cetane numberD
The cetane number is of little significance in the combustion process
考题
单选题Which of the listed statements is correct concerning the starting of centrifugal pumps?（）A
They should always be started with the discharge valve closedB
They should always be started with the discharge valve openedC
A priming pump is always required to flood the impeller suctionD
They should always be started with the sealing line valves closed
考题
单选题Concerning the management of sewage treatment plant using activated sludge, which of the following is correct?（）A
the plant should be prohibited to supplying airB
the plant should work at intervalsC
the plant should be added disinfector in timeD
we should check strength of activated sludge, ivory-white color is best
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单选题Which of the following statements about general cargoes is not correct?（）A
General cargoes are neither liquid nor solid bulk cargoB
General cargoes are packaged hazardous cargoesC
General cargoes are also called breakbulk cargoesD
General cargoes are mostly carried on container ships now
考题
单选题Which of the following statements concerning fuel atomization in a diesel engine cylinder is correct?（）A
The greater the atomization, the greater the penetrationB
The greater the atomization, the less the penetrationC
The degree of atomization has nothing to do with the degree of penetrationD
Atomization and penetration are one and the same
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单选题Which of the following statements is correct concerning the viscosity of lubricating oil?（）A
Viscosity will increase as temperature increasesB
Viscosity is a measure of a fluid s internal resistance to flowC
Viscosity will decrease as temperature decreasesD
Viscosity is not dependent on temperature
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单选题Which of the following statements concerning a simple parallel resistance circuit is correct?（）A
The voltage drop across each resistor is the sameB
The total current flow equals the reciprocal of the sum of the individual currentsC
The total resistance equals the sum of the individual resistancesD
The total voltage equals the sum of the individual voltages across each resistance
考题
单选题Which of the following statements is correct relative to distillation plant operation?（）A
Distillation is the process of boiling seawater to produce vapor which is condensed into fresh waterB
Evaporation is the second part of the distillation process where brine is removedC
Brine is the result of condensed sea water vaporD
Distillate is the product resulting from the evaporation of fresh water vapor
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