
【名词&注释】
直升机(helicopter)、相对运动(relative motion)、挥发性(volatile)、齿轮泵(gear pump)、紧急警报(red alert)、无障碍(barrier-free)
[单选题]电动齿轮泵排出压力过高的危害不包括________。
A. 轴承径向力过大
B. 磨损和漏泄增加
C. 困油现象加重
D. 电动机过载
查看答案&解析
举一反三:
[单选题]闭杯闪点()作为划分易挥发性液货和不易挥发性液货的标准。
A. 15℃
B. 23℃
C. 60℃
[单选题]If the engine does not start on air, it may be due to
A. low compression of the fuel pumps
B. incorrect timing of fuel pumps
C. the starting air valves stuck
D. air-locks in fuel oil pipeline
[单选题]摩擦副相对运动时,由于摩擦表面金属与周围介质发生化学、电化学和机械作用而使摩擦表面金属损失的现象,称为( )。
A. 磨粒磨损
B. 黏着磨损
C. 腐蚀磨损
D. 表面疲劳磨损
[单选题]听到紧急警报(red alert)后,船员首先采取行动是_______。
A. 确认警报类别
B. 迅速行动
C. 保护旅客安全
D. 自己逃生
[单选题]直升机进行救援,要求吊运区周围无障碍(barrier-free)至少:
A. 15m
B. 18m
C. 27m
[单选题]If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will .
A. have a larger than normal dead band
B. produce excessive speed response to a load change
C. respond slowly to any change in engine load
D. stabilize engine speed at the new governor setting
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