A.They might feel less depressed. B.They might improve their immune system. C.They might give up all pleasures. D.They might be more likely to become sick.
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【简答题】052-3 悬臂梁由两根 T 形截面叠起来放置 ( 略去相互之间的摩擦力 ) ,受力加图所示。任一横截面上的正应力分布规律应是 ______ 。