vacuum tube base是什么意思

用法例句

A new method for boring the socket joint base of welded tubes was introduced,and it was featured of time saving and good processing quality.

针对快锅过热管有部分承插焊管座处于上、下联箱之间 ,空间只有 170mm ,加工难度相当大的情况 ,介绍了一种新型的镗削加工方法 ,既节省时间又保证了加工质