施焊完成或下班时必须拉闸断电,要留有充分时间观察,确认()后,方可离去。
A.周围无易爆物
B.周围无易燃物
C.已熄灭
D.无复燃的危险
参考答案:C
用所给动词的适当形式填空
1. I prefer _____(stay) at home to _____(go) out on Sunday.
2. She asked me if I _____(go) to the park with her the next week.
3. At the gate of the school there are a lot of people _____(wait) to see the headmaster.
4. It is a _____(use) car. It's worth$1,000 at the most.
5. The movie is well worth _____(see) twice.
以体表面积计算儿童用药剂量比较合理。按公式计算,22公斤重儿童的用药剂量应为成人剂量的
A.0.45B.0.50C.0.55D.0.60E.0.65