单选题Start the turning gear, and with some one hand-operating the cylinder lubricators at regular intervals, and with the indicator cocks （）, and with the control gear in the （）position, give the engine at least one complete turn.Aopen；“stop”Bclosed；“stop”Copen；“start”Dclosed；“start”
单选题
Start the turning gear, and with some one hand-operating the cylinder lubricators at regular intervals, and with the indicator cocks （）, and with the control gear in the （）position, give the engine at least one complete turn.
A
open；“stop”
B
closed；“stop”
C
open；“start”
D
closed；“start”
参考解析
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