【名词&注释】
发动机
[单选题]对每台不能换向的发动机在冷机条件下连续起动次数应不少于()次。
A. 3
B. 6
C. 12
D. 15
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学习资料:
[单选题]航行中在舵机工作正常的情况下,舵沉重的原因可能是()。
A. 舵杆变形
B. 舵承损坏
C. 舵系安装不良
D. 舵杆折断
[单选题]The bore of each cylinder is formed in a liner which can be () when worn out.
A. welded
B. replaced
C. drilled again
D. bored
[单选题]Excessive vibration of an automatically fired auxiliary boiler can be caused by ()
A. air or water in the furnace
B. combustion pulses
C. fuel oil pump failure
D. flame failure
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