面四幅气候类型图,从左到右表示的气候类型依次是
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Name: Kelsey
Age: 22
I can sing and dance. I can play the violin and the piano, but I can't play the guitar.
Name: Paul
Age: 13
I can sing, but I can't dance. I can play the trumpet and the guitar but I can't play the violin.
Three years ago my parents encouraged me keyboard, but for some reason, I gave up.
如图,已知“人字梯”的5个踩档把梯子等分成6份,从上往下的第二个踩档与第三个踩档的正中间处有一条60cm长的绑绳EF,tanα=52,则“人字梯”的顶端离地面的高度AD是( )