【名词&注释】
危险性(risk)、活塞环(piston ring)、救生艇(boat)、耐磨损(abrasion resisting)、适用于(suitable for)、表面光洁(surface finish)、要注意(should be noticed)
[单选题]对活塞销的主要要求有________。I．强度高II．刚性好III．抗高温腐蚀IV．耐磨损V．表面光洁(surface finish)VI．抗低温腐蚀
A. II+III+IV+VI
B. I+II+IV+V
C. III+IV+V+VI
D. II+III+V+VI
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举一反三：
[单选题]划分可燃液体危险性的依据是_______。
A. 挥发点。
B. 闪点。
C. 自燃点。
D. 燃点。
[单选题]用从扫气口用硬棒触动观察的方法检查和判断活塞环的状态，如发现所触动的环在环槽中不需用力就能活动自如，则说明该活塞环______。
A. 正常
B. 断裂
C. 弹力不足
D. 过度磨损
[单选题]When a ship were found its equipment does not correspond substantially with the particulars of the Certificate by a nominated surveyor and corrective actions unable to be taken, then
A. the Certificate would be withdrawn
B. the ship owner would be fined
C. the shipping company must be notified immediately
D. the ship must proceed to the nearest appropriate repair yard for a repair without delay
[单选题]You are attempting to parallel two AC generators and the synchroscope pointer is revolving in the slow direction. This indicates that the frequency of the incoming machine is
A. higher than the bus frequency
B. lower than the bus frequency
C. file same as file bus frequency but out of phase with it
D. the same as the bus frequency, and the circuit breaker may be closed at nay pointer position
[单选题]SOLAS公约对救生艇机燃料储备的要求是，应配备适用于船舶营运航区预期温度范围内足够的燃料，以供满载的救生艇以6kn的航速运转不少于______，发动机还应能在救生艇离水冷态运转不少于_______。
A. 24h/5min
B. 24h/3min
C. 24h/10min
D. 12h/5min
[单选题]在操艇接近船舶进行回收救助艇操作时要注意(should be noticed)（）
A. 将艇操至吊钩下、顺利挂好吊钩、将艇吊离水面
B. 操艇先带好艇首缆绳、再将艇移至吊钩下挂钩绞起
C. 先带好救助艇的舫艇稳索，再挂好吊钩吊艇离水
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