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你发现了什么规律?
I think July is ____ (hot) than any other month in our country. It's ____ (hot) month of the year.
AB边靠在竖直墙面上,物块与墙面间的动摩擦因数为μ.F是垂直于斜面BC的推力,物块沿墙面匀速下滑,则摩擦力的大小为( )