A.潤(rùn)滑系統(tǒng) B.控制系統(tǒng) C.冷卻系統(tǒng) D.調(diào)節(jié)系統(tǒng)
A.10ms B.30ms C.50ms D.100ms
A.1% B.2% C.3% D.4%