晶闸管—电动机可逆直流调速系统的可逆电路形式有（）。A、两组晶闸管组成反并联连接电枢

反比例函数

的图象在第二、四象限，则n的取值范围为（），A(2，y₁)，B(3，y₂)为图象上两点，则y₁（）y₂(用“＜”或“＞”填空)

   At the meeting he gave us some suggestions, one of which was that we____ someone to check the information.

A. sent    B send     C. would send    D. should have sent

If we learn to appreciate _____ is new and different, we will be well-prepared for ____ the future may have in store.

A．that; whatever

B．what; whatever

C．that; whichever

D．which ; that

今天是2007年5月26日，星期六，那么距2008年奥运会（从今天算起）还有______天，是星期______．

每年提取的折旧额相等是工作量法计提折旧的特点。( )