投运后,110kV变电站蓄电池组每()年进行1次全容量核对性充放电。
A.1
B.2
C.3
D.4
参考答案:C
In fact , the old couple looked forward every week their grandson .
A.to see
B.to seeing
C.see
D.seeing
简述导热油的化学成分对其热稳定性的作用。