如图所示，质量为m₁和m₂的两个物体用细线相连，在大小恒定的拉力F作用下，先沿水平面，再沿斜面（斜面与水平面成θ角），最后竖直向上运动．则在这三个阶段的运动中，细线上张力的大小情况是（   ）

    In China, there are many traditional(传统的)holidays. The most important one is the Spring Festival. People like it very much. On the Spring Festival, people don't work. Children don't go to school. People clean their rooms. Mothers make dumplings. Kids can get lucky money. Besides this festival, the Dragon Boat Festival and the Mid­Autumn Festival are also popular. On the Dragon Boat Festival, people eat zongzi and have dragon boat races. On the Mid­Autumn Festival, people eat moon cakes and watch the moon. How happy they are!

规定运算：a☆b=5a﹣2b，求（$\frac{3}{5}$☆$\frac{4}{3}$）☆$\frac{2}{3}$．

How many  ?