若在一水平放置的弹簧测力计的提环和挂钩上各施加相反的5N拉力

若在一水平放置的弹簧测力计的提环和挂钩上各施加相反的5 N拉力，则弹簧秤的示数为（）

A．10N

B．5 N

C．0 N

D．不能确定

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