下列那些测试不用同时使用光接口板和电接口板来测试(). ["A.输入抖动容限","B.输出抖动","C.结合抖动","D.映射抖动","E.保护倒换时间测试"]
涂胶密封工艺分为()。 ["细密封","粗密封","不密封"]
金属材料热处理时,奥式体形成第四阶段称为()。 ["A、残余渗碳体溶解","B、奥氏体晶核长大","C、奥氏体分成均匀化","D、亚共析钢成核"]
PVC胶有很好的()性能。 ["机械性密封","防锈性密封","耐腐性"]
下列那些测试在测试时需要加加频偏(). ["A.输入抖动容限","B.输出抖动","C.结合抖动","D.映射抖动","E.输入口允许频偏"]
润滑的有什么好处?