问题
单项选择题
The expression STAND-BY ENGINE means:（）.
A.to get the engine ready
B.to respond to the engine
C.to maneuver the engine
D.to change the engine
答案
参考答案：A
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The expression STAND-BY ENGINE means:（）.
A.to get the engine ready
B.to respond to the engine
C.to maneuver the engine
D.to change the engine
参考答案：A