女生有25人,男生有20人.男生人数占女生的______%.
20÷25=80%;
故答案为:80.
—Excuse me, is this your backpack?
—_____[ ]
A. Sorry, I don't know
B. Yes, it is. Thank you
C. Your backpack is in my room
D. It's black
微机视屏显示终端(VDT)操作人员,由于静态负荷,频繁操纵键盘,头部经常转动,手臂悬空,最易引起
A.四肢骨关节炎
B.滑囊炎
C.颈肩腕综合征
D.骨关节坏死
E.垂腕