油浸式消弧线圈竣工（预）验收标准卡中控制屏、并联电阻箱接地，各箱体外壳应（）。
A.接地良好
B.无渗油
C.无孔洞
D.无毛刺
参考答案：A
消息的开头部分通常是被称作（）。
根据句意,用方框中所给的词的适当形式填空。
1. She spends lots of time _____housework.
2. Li Lei _____swim in the river last year. Look, he is swimming.
3. His mother is ill at home. He _____look after her very day.
4. Tom's life became difficult after his.father's _____.
5. He_____school last year. He wasn't a student any more.
