单选题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 （）.Athe pulse-phase systemBthe pulse Doppler systemCthe pulse systemDthe pulse interval
单选题
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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