A.滯后開(kāi)啟,提前關(guān)閉 B.提前開(kāi)后,滯后關(guān)閉 C.提前開(kāi)啟,提前關(guān)閉
A.30 B.60 C.180
A.油底殼 B.連桿組 C.曲軸飛輪組