He showed him how to blow into the ivory mouthpiece.他给他演示如何吹奏象牙吹口乐器。He bellowed information into the mouthpiece of his portable telephone.他对着手机话筒吼了一通信息。Blake held his handkerchief over the mouthpiece to muffle his voice....
焊缝外要避免电弧穿刺.Arc strikes outside of the welds were avoided.我们总是用直流(交换 ) 电弧焊机焊吸收子.We used to weld pipes with direct. C are welder A . C . welder.介绍了利用复合梁理论测量高速电弧喷涂层弹性模量的方法.An effective three - point bending test based on co...