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...
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...
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....