A.60% B.70% C.75% D.80%
A.10%發(fā)動機(jī)額定轉(zhuǎn)速 B.50%發(fā)動機(jī)額定轉(zhuǎn)速 C.怠速 D.發(fā)動機(jī)額定轉(zhuǎn)速