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單項選擇題

Acid solution（） in the system can be tested from time to time by putting some on to a piece of lime.

A.strength
B.dense
C.percentage
D.velocity

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單項選擇題

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

單項選擇題

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

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