惯性原理
参考答案：是指一切物体在没有外力作用时，一直保持均速直线运动状态或静止状态。
— Would you please ______ football near my home?
— ______.[ ]
A. not to play; No
B. not play; Yes, I will do that again
C. not play; Sorry, I won't do that again
D. don't play; Sorry, I won't do that again
若紧急逃生呼吸器气瓶内的压力低于工作压力的（）应进行检查或充气.
A.90%
B.92%
C.95%
