单选题The trouble-free life of an engine indicates （）.Athe period of time during which no trouble occurs to the engineBno trouble will occur to the engine all its lifeCtrouble may occur freely to the engineDno matter what you do to the engine, no trouble will occur during this period
单选题
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
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