單項(xiàng)選擇題

半拖鞋式活塞和拖鞋式活塞的優(yōu)點(diǎn)是（）

A.質(zhì)量輕
B．適合安裝在高速發(fā)動(dòng)機(jī)
C．可以減小與氣缸的配合間隙
D．能避免與曲軸發(fā)生運(yùn)動(dòng)干涉
E．可以增加活塞的行程

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