The trouble-free life of an engine indicates （）.<br>A:the period of time during which no trouble occurs to the engine<br>B:no trouble will occur to the engine all its life<br>C:trouble may occur freely to the engine<br>D:no matter what you do to the engine, no trouble will occur during this period

The trouble-free life of an engine indicates （）.
A:the period of time during which no trouble occurs to the engine
B:no trouble will occur to the engine all its life
C:trouble may occur freely to the engine
D:no matter what you do to the engine, no trouble will occur during this period

出自：海船船员证

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