某物体受到三个共点力的作用,能处于平衡状态的是()
A.1N,3N,5N
B.5N,3N,5N
C.1N,7N,5N
D.9N,3N,5N
参考答案:B
听器冲击伤的治疗主要是()。
A.防治感染
B.药液冲洗外耳道
C.干纱条填塞
D.鼓膜穿孔修复术
E.氧治疗
You can borrow my bike_______you return it before 5 pm. [ ]
A. unless
B. now that
C. until
D. so long as