设置在有关单位的人民防空警报设施，由（）维护管理，不得擅自拆除。
A.当地政府
B.人民防空主管部门
C.其所在单位
参考答案：C
用所给单词的适当形式完成下列句子。
1. There are many (dish) on the table.
2. When (do) you arrive here yesterday?
3. Jenny usually (eat) lunch at home.
4. Danny and Jenny can speak a little (China).
5. How many (bus) are there in front of the park?
电源应接在变频器主回路R、S、T端子上。
