特殊用法exhaust tappet1.排气阀挺杆hydraulic tappet1.液压挺杆locking tappet1.锁簧; 锁尺, 锁条plunger tappet1.柱塞挺杆positive [negative] tappet1.正[负]挺杆, 双单向挺杆roller tappet1.滚柱挺杆shedding tappet1.凸轮推杆随动件