单项选择题
A.提高电耗 B.降低电耗 C.改变转速 D.调节节流阀
A.255g／h B.195g／h C.150g／h D.105g／h
A.2 B.3 C.4 D.1
A.0.3% B.0.1% C.99% D.78%
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