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 （）.<br>A:the pulse-phase system<br>B:the pulse Doppler system<br>C:the pulse system<br>D:the pulse interval

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

出自：海船船员证

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