机电式（感应系）单相电能表的电流进出线不能接反，否则电能表倒走。
参考答案：对
—If you go to the post office，would you please get me a stamp？
—I am ______ willing to.
A．no more than
B．not more than
C．more than
D．no less than
为了保证动环的追随性，采取在靠近辅助密封接触区轴套表面（）的措施。
A.增加粗糙度
B.渗碳
C.喷涂陶瓷
D.渗氮
