选择题：4简支梁在对称荷载作用下，其两端支座反力必（）。

题目内容：

4简支梁在对称荷载作用下，其两端支座反力必（）。 A A.等于零
B B.对称相等
C C.反向相等
D D.以上都不对

参考答案：

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