The purpose of engine stand-by is that __________.
A. the main engine in the stand-by condition
B. auxiliary machinery in the stand-by condition
C. dynamical equipment in the stand-by condition could be used immediately
D. A and B
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We should not start the engine unless turning gear is __________.
A. on
B. disengaged
C. bolted
D. unscrewed
Before “standby” is rung on the engine telegraph, it is usual to give the main engine __________ ahead and astern.
A. a brief trial with turning gear
B. a brief trial on power
C. a long trial by steering gear
D. a long trial on air
回归年等于()朔望月的长度
A. 11
B. 12
C. 12.3683
D. 13.3683
回归年和朔望月的平均长度分别为()
A. 365.2422天, 29.5306天
B. 365.2425天, 29.5603天
C. 365.2425天, 29.5036天
D. 365.2422天, 29.5036天
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