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t=50n t=50-n t= t=50+n
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=, ={x|x<0,x∈R.},则A.⊕B.=( ) A. B. ∪[0,+∞) ∪(0,+∞)
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N50mm N75mm N100mm N150mm
5 n mile 3 n mile 2 n mile 1 n mile
5 n mile 3 n mile 2 n mile 1 n mile
重为10N,当压力为50N时,物体沿竖直墙面匀速下滑;当压力增大到60N时,物体处于静止状态。则物体静止时受到的摩擦力是( ) A.小于10N 10N 50N 60N