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两手对拉一弹簧秤,它的示数是10 N,这两手的拉力分别为( )
A.5 N,5 N B.10 N,10 N C.0 N,0 N D.20 N,20 N
两手对拉一弹簧秤,它的示数是10 N,这两手的拉力分别为:
A.5 N,5 N; B.10 N,10 N; C.0 N,0 N; D.20 N,20 N.
A.5 N,5 N B.10 N,10 N
C.0 N,0 N D.20 N,20 N