智能电网调度支持系统实时监控预警应用试点单位是()。
A.华中
B.华东
C.华北
D.西北
参考答案:C
John invited approximately 40 guests to his wedding, most of _______ are family members.
A.whom
B.that
C.them
D.which
-3x-my2与5x3y2是同类项,则m的值是( )
A.-2
B.-5
C.3
D.-3