单项选择题

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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单项选择题

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

单项选择题

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

单项选择题

A.of
B.up of
C.from
D.out