密封的功能是防止（），起密封作用的零件称为密封件。
参考答案：漏泄
何谓变压器短路损耗？
The Grammar-Translation Method was at one time called ______ since it was first used in the teaching of the classical languages of Latin and Greek.
A. aural-oral method B. minimum methodC. Audiolingual Method D. Classical Method
