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名词解释题
Goal Motion摄影
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考题
The missiles missed their _________, so the research group did not reach its _________.
A.target, targetB.goal, goalC.goal, targetD.target, goal
考题
It is stated in astrology that ________.[A] the sun is so distant from us that it was hard to follow its motion[B] the sun was moving westward around the sky[C] the motion of the sun is at the rate of about thirty degrees every week[D] the motion of the sun is similar to the revolution of the earth around the sun
考题
Pitching is angular motion of the vessel about what axis(轴)?A.LongitudinalB.TransverseC.VerticalD.Centerline
考题
共用题干
Motion SicknessLiving in space looks like lots of fun.You can do certain things in space(like floating around,or pushing huge objects)that you cannot do on earth.But being in space can do things to you,too.If you stay too long in a gravity-free environment,your bones could become weak,and a small spaceship just might annoy you after a while,because space travel could make you seasick!On July 4, 1982,after seven days orbiting the earth,astronauts Thomas K. Mattingly and Henry W. Hartsfield returned home.Although not all of the experiments on board worked properly,the flight basically seemed to be a success except for one"little"thing: early in the flight,astronaut Hartsfield became"seasick".Thomas Mattingly,who is also a jet pilot and is highly resistant to motion sickness on earth,did much better.Mattingly sailed through space with a steady stomach.But no one knows why Hartsfield felt uneasy and Mattingly did not.So far it seems there is no reliable way to predict who will become motion sick in outer space and who will not.In all,at least four astronauts have suffered from space motion sickness. Russian and American scientists are working together to try to understand and solve the motion sickness.Space program officials worry that if so many highly-trained pilots get sick in space,what will happen when civilians start flying in the shuttle?Motion sickness is a disagreeable feeling that comes from the pitching,rolling, swaying,or just the moving of the object you are riding in or on.Symptoms of motion sickness include:dizziness,headache,a sinking feeling in the stomach,and vomiting （呕吐）.Why does motion make some people ill?Doctors believe that motion sickness is caused by a disturbance in the inner ear.Our ears do more than give us hearing.A part of the ears gives us a sense of balance and helps make us aware of whether we are right side up or upside down.If you know that you get carsick or seasick,what can you do?Speak to your doctor. There are certain medicines available that can help stop that uneasy feeling.But many of them can also make you sleepy.Usually they work best takenbefore you begin feeling ill.Some people also recommend water,ice cubes,mints,or plain toast.But these remedies do not always work for everyone.Perhaps,since motion sickness is such a big problem in outer space,researchers may soon find a way to cure the astronauts一and those of us who stay on earth.Untrained civilians are more likely to suffer from motion sickness in a spacecraft.A:Right B:Wrong C:Not mentioned
考题
单选题The connecting rob is fitted between the crosshead and the crankshaftIt transmits the firing force, and together with the crankshaft convert the （） motion to a （） motion.A
rotary；reciprocatingB
up and down；fore and aftC
fore and aft；up and downD
up and down；rotary
考题
单选题Wristpin bearings are difficult to lubricate because of their oscillating motion and（）A
their free-floating designB
their relatively small sizeC
the reciprocating motion of the pistonD
their position in the lubrication system
考题
单选题The connecting rod is fitted between the crosshead and the crankshaftI t transmits the firing force, and together with the crankshaft converts the （）motion to a （）motion.A
rotary；reciprocatingB
up and down；fore and aftC
fore and aft；up and downD
up and down；rotary
考题
单选题The exhaust ports of a diesel engine using the cross-flow scavenging method are opened and closed by the （）A
reciprocating motion of exhaust valvesB
rotary motion of the camshaftC
reciprocating motion of the pistonD
developed differential
考题
单选题What is the lifesaving signal for You are seen -assistance will be given as soon as possible?（）A
3 white star signalsB
Horizontal motion with a white flagC
Vertical motion of a white lightD
Code letter K by blinker light
考题
单选题The angular motion of a ship in the athwart ship is termed（）.A
pitchingB
yawingC
rollingD
tracking
考题
单选题The angular motion of a ship in the athwartship is termed（）.A
pitchingB
yawingC
rollingD
tracking
考题
单选题A quick and rapid motion of a vessel in a seaway is an indication of a (n)（）.A
large GMB
high center of gravityC
excessive free surfaceD
small GZ
考题
单选题A slow and easy motion of a vessel in a seaway is an indication of a（）.A
small GMB
low center of gravitC
stiff vesselD
large GZ
考题
单选题The rotary motion of a diesel engine crankshaft is obtained from the up and down motion of the piston via the （）.A
camshaftB
reduction gearsC
rocker armD
connecting or piston rod
考题
单选题The linear motion of a diesel engine piston is converted to the rotary motion required to drive gears, propeller shafts, and generators by the （）.A
flywheelB
crankshaftC
journal bearingsD
camshaft
考题
单选题The projection on a shaft designed to change circular motion into up and down or back and fore motion is called （）.A
wheelB
crankshaftC
running gearD
cam
考题
单选题As the designated rudder angle is being achieved, as a result of the original command input, the steering gear follow-up mechanism is（）A
in motion, providing a null inputB
not in motion, thus providing a null inputC
in motion, providing an input to place the main pump on maximum strokeD
in motion, providing an input to place the main pump at null stroke
考题
单选题The securing systems for containers were developed to prevent container movement during which ship motion?（）.A
SurgeB
RollC
SwayD
Yaw
考题
单选题When using carbon dioxide to fight a fire on a bulkhead，the CO2 should be applied（）.A
first to the bottom of the flaming area，sweeping from side to side，and following the flames upwardB
in a circular motion from the middle of the bulkhead outwardC
to the top of the flaming area，sweeping from side to side，and working toward the bottomD
in an up-and-down motion from one side of the bulkhead to the other
考题
名词解释题Staff Motion摄影
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