A.滴點(diǎn)潤(rùn)滑 B.油環(huán)潤(rùn)滑 C.飛濺潤(rùn)滑 D.壓力潤(rùn)滑
A.65% B.78% C.82% D.94%
A.活潑B.助燃C.不活潑D.燃燒