正确答案: B

I+II+IV+V

题目：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VI．抗低温腐蚀

解析：B

查看原题

举一反三的答案和解析：

[单选题]划分可燃液体危险性的依据是_______。

闪点。

[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______。

断裂

[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

the Certificate would be withdrawn

[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

lower than the bus frequency

[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_______。

24h/5min

[单选题]在操艇接近船舶进行回收救助艇操作时要注意（）

操艇先带好艇首缆绳、再将艇移至吊钩下挂钩绞起