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
A.after the point is reached at which the failures begin to increase rapidly B.before the point is reached at which the failures begin to increase rapidly C.before the point is reached at which the failures begin to increase slowly D.after the point is reached at which the failures begin to increase slowly
A.no equipment in contact with sea water B.less equipment in contact with fresh water C.more equipment in contact with sea water D.less equipment in contact with sea water
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