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