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【单选题】
下列关于扭矩的正负规定说法正确的是（  ）
A.
右手法则，离开截面为负，反之为正
B.
左手法则，离开截面为负，反之为负
C.
右手法则，离开截面为正，反之为负
D.
左手法则，离开截面为正，反之为负
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