铅蓄电池出现()情况应进行过充电。
A.电压降低
B.蓄电池液面降低
C.极板硫化
D.放电完后
参考答案:C
The teacher asked me _______ the windows after school.
A. close B. to close C. closing
房屋附属设施的契税应如何计算?