保证低压断路器系统故障时上下级动作的选择性是为了保证系统中不发生():
A.短路
B.漏电
C.越级跳
D.过载
参考答案:C
RA最常累及的关节是()
A.远端指间关节
B.拇指关节
C.腰骶关节
D.近端指间关节
E.髂关节
根据汉语或首字母提示写单词,完成句子。
1. My baseball is u _____ the chair.
2. His f _____ teacher is Miss Green.
3. When is your Chinese s _____ contest?
4. How much are these black _____ (短裤)?
5. She doesn't like salad or _____ (鸡肉).
6. What c _____ does your cousin want to join?
7. The s_____ T-shirt is thirteen dollars, but the big T-shirt is 30 dollars,
8. When is my speech _____ (竞赛)?
9. Jeff and Helen are Jim's p _____ . Jim is their son.
10. She thinks thrillers are very s _____ .