问题
选择题
小明用水平方向的力，推静止在水平地面上的桌子，但没有推动，关于小明对桌子的推力与桌子受到的摩擦力的大小关系，下列说法正确的是（ ）
A．推力小于摩擦力
B．推力等于摩擦力
C．推力小于桌子的重力
D．推力等于桌子的重力
答案
由于小车没有推动，小车处于静止状态，在水平方向上所受的推力与摩擦力是一对平衡力．所以摩擦力等于拉力．故A、C、D错误．
故选B
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小明用水平方向的力，推静止在水平地面上的桌子，但没有推动，关于小明对桌子的推力与桌子受到的摩擦力的大小关系，下列说法正确的是（ ）
A．推力小于摩擦力
B．推力等于摩擦力
C．推力小于桌子的重力
D．推力等于桌子的重力
由于小车没有推动，小车处于静止状态，在水平方向上所受的推力与摩擦力是一对平衡力．所以摩擦力等于拉力．故A、C、D错误．
故选B
My aunt works in Beijing. I visited her during last summer vacation. Beijing is a beautiful city. A lot of foreigners go sightseeing there. My aunt and I got up early on Saturday morning and we went to the Great Wall by car. We returned to the center of the city at four and visited the Palace Museum. The next morning we went to the Summer Palace by bike. That afternoon, we rode to the Beijing Zoo. We saw pandas there. And after supper we took a bus to Beihai Park. We were tired, but I think we had a good time there. 根据上述短文内容，完成下列表格。
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