单项选择题
A.noted by the bridge officer
B.told by last duty engineer
C.observed
D.in the instruction manual
单项选择题 During an engine room watch if immediate action is necessary to ensure safety of the ship its machinery and crew （）
单项选择题 In the engine department, the （） is looked upon to provide the leadership that is needed.
单项选择题 （） is a precaution which contributes to avoiding trouble under normal operating conditions.