题干
阅读理解
IT'S MY BIRTHDAY Ann hopes you can come to her birthday! | |
Time | Twenty to six in the afternoon |
Date | Monday, July 14th |
Place | Flat 9B West Wing Tower |
Phone | 875-4615 |
Note | The more friends, the better. |
的光滑斜面上，当细绳由水平方向逐渐向上偏移时，细绳上的拉力将 ( )
