选择题：14.一梁截面上剪力左上右下,弯矩左顺右逆,描述正确的是( )。(本题2.0分)A. 剪力弯矩均为正

题目内容：

14.一梁截面上剪力左上右下,弯矩左顺右逆,描述正确的是( )。(本题2.0分)
A. 剪力弯矩均为正
B. 剪力弯矩均为负
C. 剪力为正弯矩为负
D. 剪力为负弯矩为正

参考答案：

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