A.最低點(diǎn) B.最低點(diǎn)的90° C.最低點(diǎn)的180° D.最低點(diǎn)的150°
A.1/2 B.1/3 C.1/4 D.2/3
A.潤(rùn)滑油油質(zhì)不合格 B.潤(rùn)滑油箱油位低 C.供油量不均勻 D.回油不暢