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單項選擇題

If the engine （） for a long period, there will be a danger of frost.

A.must to stand inoperative
B.has to stand inoperative
C.must be stood idle
D.will stand idle

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單項選擇題

If the atomizer holes are enlarged beyond the makers recommended size, the atomizer must be （）.

A.repaired
B.replaced
C.replenished
D.repeated

單項選擇題

If diesel oil in this tank is used, the （） of the oil must not exceed 120 degree F.

A.viscosity
B.flash point
C.acid value
D.temperature

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