高架桥空线路断线,线头落在身旁的地面上,应一脚抬起或两脚在一起蹦出()m以外,并设法切断电源或采取措施防止他人靠近。
A、15
B、20
C、22
D、25
参考答案:D
小题1:Shall I __________ (介绍) you to my classmates?
小题2:The __________ (侦探)spent the whole night waiting for the thief.
小题3:He was ___________ (解雇)by his boss for no reason .
小题4:As a student, you have to b__________ work and play, or you might fail your exams.
小题5:Young ladies are running after a slim f__________ ,aren’t they?
小题6:We r____________ to inform you that our library will be closed.
小题7:The school can’t t_________ such bad behavior.
雷击地面物体时,主放电时间约为__________。