单选题Which of the turbo-charging systems listed operates with the least average back pressure in the exhaust manifold?（）AConstant volumeBConstant pressureCPulse pressureDRadial flow
单选题
Which of the turbo-charging systems listed operates with the least average back pressure in the exhaust manifold?（）
A
Constant volume
B
Constant pressure
C
Pulse pressure
D
Radial flow
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解析：
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