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锡降落(tin parachute)
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更多 “锡降落(tin parachute)” 相关考题
考题
Because of the high loads the bearing material is a tin-aluminum(锡-铝) alloy bonded to a steel shell. The crosshead pin is highly polished to a______.A.flat surfaceB.mirror finishC.sloping(倾斜的) surfaceD.inclined(倾向的) surface
考题
单选题The color of rockets,shells,or rocket parachute flares used to indicate that the vessel is in distress and requires immediate assistance is().A
whiteB
greenC
redD
yellow
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