A. N. s. I. standard b2.4-this standard controls NIBCO hose couplingscrew threads.
标准B2.4 -这个标准控制美国尼必可软管连接螺丝螺纹。
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This paper presents a high efficient process method of a steep lead tread of couplingscrew and studies the profile accuracy by using electronic computer and arrives at the profile error curve.
In the second chapter, the interaction among a screw dislocation, circular interfacial crack and inclusion is solved based on the electromechanical coupling relation of piezoelectric material.