Now generally used PTEE, EPDM and other material for the valve seat, so bubbles leakproofness good.现一般均使用PTEE 、 EPDM等材料,为阀座, 因此,气泡密封性佳.Especially in automobile industry, the leakproofness of cylinder influences the perfo...
文件的初稿是谁草拟的?Who made the first draft of the document?他翻了翻我草拟的方案就表示同意接受.He sketched a glance at my plan and accepted it.草拟的规则也许不太现实而且冗赘.The proposed rules may be unrealistic as well as onerous....
They signed an agreement that parcelled out the Middle East into several spheres of influence.他们签订了一项协议，将中东瓜分为几个势力范围。They are self - pollinating, generating small seeds like black spheres.它们是自花受粉的植物, 结出小型的黑色球体般的种子....cou...