
【名词&注释】
塑性变形(plastic deformation)、润滑剂(lubricant)、第一次(the first time)、水上飞机(seaplane)、一部分(part)、水面上(a water surface)、机动船(motor vessel)、潜水艇(submarine)
[单选题]An alternator is being paralleled with one on the line At the instant the circuit breaker is close, the frequency of the incoming alternator will normally
A. increase
B. not change
C. decrease
D. be exactly 60 hertz
查看答案&解析
举一反三:
[单选题]In the navigation,_______cause the shafting over load most easily
A. stopping the main engine suddenly
B. changing the main engine running direction suddenly
C. the sailing from the shallow water area to the deep water area
D. the ship's trim too much
[单选题]在第一次上紧贯穿螺栓时,由于螺栓各承压部分产生塑性变形,使一部分预紧力丧失,解决的办法是上紧前( )。
A. 先上紧螺栓,然后再旋松
B. 将螺栓和承压面彻底清洁干净
C. 在螺栓和承压面之间涂以适当的润滑剂
D. 将螺栓和承压面彻底清洁干净和在螺栓和承压面之间涂以适当的润滑剂
[单选题]I haven’t bought ________ toys for my children
A. any
B. some
C. a
D. an
[单选题]互见中的一艘机动船(motor vessel),当与下列船舶相遇存在碰撞危险时,下列何者属于直航船________。
A. 右舷125度方向驶近的大油轮
B. 左舷60度方向驶近的水面上(a water surface)水上飞机
C. 正前方驶近的帆船
D. 左舷60度方向驶近的潜水艇(submarine)
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