﹣3x﹣my2与5x3y2是同类项，则m的值是 [ ]
A．﹣2
B．﹣5
C．3
D．﹣3
答案：D
According to the rules of Daddy, where are we going?, nobody _______ take along with them cash and cell phones.
A．must
B．may
C．will
D．shall
充电时，蓄电池端电压（）电动势。
A、大于
B、等于
C、小于
