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單項(xiàng)選擇題

According to the way the energy of the exhaust gases is utilized, pressure-charging can be divided into two main systems, namely, the constant-pressure system and （）.

A.the pulse-phase system
B.the pulse Doppler system
C.the pulse system
D.the pulse interval

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單項(xiàng)選擇題

About half an hour before the engine is required, cooling water at （） must be circulated.

A.more than the working temperature
B.less than the working temperature
C.the working temperature
D.the same as the surrounding temperature

單項(xiàng)選擇題

A: Please tell me the specifications and quantity.
B: （）

A.Pump diesel oil first
B.300 tons of 180 cst fuel oil
C.The figure is all right
D.OK, I’ll sign it