分段器与重合器的最主要区别是什么?
参考答案:
①分段器没有短路开断能力;
②分段器只根据“记忆”的过电流脉动次数动作
I want to _______ a _______ basketball player, but my mother don't agree with me.[ ]
A. be, profession
B. be, professional
C. do, professional
D. do, profession
两德统一后,当时德国最大的报团是( )
A.莫斯报团
B.谢尔报团
C.施普林格报团
D.乌尔斯泰因报团