问题
选择题
Although the working mother is very busy,she still a lot of time to her children. [ ]
A.devotes
B.spends
C.offers
D.provides
答案
答案：A
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Although the working mother is very busy,she still a lot of time to her children. [ ]
A.devotes
B.spends
C.offers
D.provides
答案：A
，压力传感器此时显示出物体对平台的压力为点火前压力的
。已知地球的半径为R，g为地面附近的重力加速度，试求此时火箭离地面的高度。