题目内容

机器将会冒白烟。

A. The engine will exhaust black smoke.
B. The engine will exhaust yellow smoke.
C. The engine will exhaust white smoke.
D. The engine will exhaust blue smoke.

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A. Remove water from oil.
B. Good for combustion.
C. Reduce wear failures.
D. All of the above.

A. When it was in good order.
B. During the repair of the ship.
C. After it was repaired.
D. Two hours later.

A. Because it was foreign-made.
Because it was good.
C. It has run for 1,000 hours.
D. It was often out of order.

A. In good order.
B. Often fails.
C. Out of order.发生故障
D. Just so so.