1. [单选题]往复泵的活塞杆密封(piston rod packing)一般选用( )。
A. 唇形密封圈
B. 0形密封圈
C. 软填料轴封
D. 机械轴封
2. [单选题]inspector
A. 检查员
B. 答复
C. 答案
D. 要求
3. [单选题]With reference to a two-ram actuating mechanism, which one of the following statement is FALSE?
A. The rams work inside cylinders.
B. The cylinders have glands sealing their open ends.
C. The rams are connected to a cross-head
D. The cross-head is mounted on the rudder stock
4. [单选题]“船舶之间的责任”条款适用的能见度是()。
A. 能见度良好的情况
B. 任何能见度,但必须两船在互见中
C. 能见度大于5 n mile的情况
D. 能见度大于2 n mile的情况
5. [单选题]多年来(many years)弃船后丧生的主要原因是:
A. 暴露
B. 溺水
C. 饥饿