单选题
When the engine RPM decreases to 500, stop the engine.
A
When stop the engine, make sure that the engine decelerates to 500 RPM.
B
If the engine decreases to 500 RPM, you must stop it.
C
When the engine RPM decreases 500, you'd better stop the engine.
答案解析
正确答案:B
相关知识点:
发动机转速降至500停发动机
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