What does curiosity feel like? It feels good. And what happens when we get curious? We start to notice that cravings are simply made up of body ______-- oh, there's ______, there's ______, there's ______-- and that these body sensations come and go.
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【单选题】图示阶梯杆 AD 受三个集中力作用,作用力大小均为 F ,设 AB 、 BC 、 CD 段的横截面面积分别为 A 、 2A 、 3A, 则三段杆的横截面上 。