原件日下午12 / 12型冲锋枪功能的单独的手动安全和消防模式选择，无论是在形式的跨螺栓按钮了。
Original PM 12 / Model 12 submachine guns featured separate manual safety and fire mode selector, both being made in the form of the cross-bolt buttons.
螺栓法兰连接是石油化工设备和管道中应用最为广泛的密封形式。
Bolted flanged connections are the most commonly used in petrochemical equipment and piping system.
而螺栓的预紧力直接影响这种鼓胀变形的形式和板片间的密封状态。
The pretension of bolts directly affects the deformation form of the deformation of bulging, and the sealing condition between the exchanger thermal sheet Spaces.
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