油压减振器的阻力是随（）的大小而改变的，减振性能比椭圆弹簧稳定。
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Radar beacons are transmitters designed to produce a（）on the screens of ship’s radar sets.
A. incorrect image
B. distinctive image
C. pictorial image
D. pictographic image
干粉显像时干燥和显像工序的安排是应先干燥，后显像。
A. 正确
B. 错误
列车在做启动试验时，当按下启动试验按钮列车将起紧急制动。
A. 正确
B. 错误
A bonding cable should be connected for cargo operations aboards a tank vessel as soon as the（）.
A. cargo has been loaded or discharged
B. cargo ghose is connected
C. cargo pumps are started
D. vessel is ready to handle cargo
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