【判断题】【消耗次数：1】
在三铰刚架中，支座反力的计算是内力计算的关键所在。（ ）
①
正确
②
错误
参考答案：
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相关题目
【单选题】
固定铰支座约束反力（）。
①
可以用任意两个相互垂直的通过铰心的力表示
②
可以用任意一个大小和方向未知的通过铰心的力表示
③
其反力的方向在标定时可以任意假设
④
其反力的方向在标定时不可以任意假设
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message
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Three-fourths of the homework ____ today.
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has finished
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has been finished
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