词
闩;A locking device and a reverse counterboring tool bar are designed, their structure and working principle are introduced.
设计了
种锁紧装置和
孔刀杆，介绍了其结构原理。
孔，镗孔，镗阶梯孔]；沉孔，埋头孔A locking device and a reverse counterboring tool bar are designed, their structure and working principle are introduced.
设计了种锁紧装置和孔刀杆，介绍了其结构原理。
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