
【名词&注释】
直升机(helicopter)、持续时间(duration)、四冲程柴油机(four-stroke diesel engine)、一分钟(one minute)
[单选题]The seven segment arrangement for numerical(数字的) display on consoles, test meters and other applications can be either______.
A. UJT or BJT
B. BCD or OCD
C. JFET or IGFET
D. LED or LCD
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举一反三:
[单选题]The output voltage of a 440 volt, 60 hertz, AC generator is controlled by the
A. prime mover speed
B. exciter output voltage
C. load on the alternator
D. number of poles
[单选题]直升机进行吊升的悬空高度一般是距甲板(艇、筏):
A. 15m
B. 18m
C. 27m
[单选题]The amount of fluid delivered by a positive displacement pump can be regulated by _____.
A. throttling the pressure line
B. changing the speed of the driving rotor
C. either A or B
D. None of the above is tree
[单选题]互见中,一艘限于吃水的船舶与一艘操限船交叉相遇致有构成碰撞危险,则________。
A. 两船均应采取避让行动
B. 有他船在本船右舷的船应给另一船让路
C. 操限船为让路船
D. 限于吃水的船舶为让路船
[单选题]一次失血超过血液总量多少时,生命活动即有困难()
A. 20%
B. 26%
C. 28%
[单选题]下列警报信号中持续时间不足一分钟(one minute)的是?
A. 堵漏
B. 弃船
C. 警报解除
D. 消防
[单选题]四冲程柴油机活塞的磨损主要发生在
A. 裙部外圆表面
B. 头部外圆表面
C. 环槽
D. 裙部下端外圆表面
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