下图示的三铰刚架受力<img src="/lqwvjeImg/69/6992dd237dce76091c02e993910e9eb7.png" style="width:17px;height:20px;">作用,则<img src="/lqwvjeImg/3b/3b2994fc1dd7db8f183a88d74cb590d3.png" style="width:16px;height:17px;">支座反力的大小为( )。<img src="/lqwvjeImg/4f/4f673c01791b9d074ebc306dfcd821f5.png" style="font-size: 20px; width: 254px; height: 150px;"><br>·<img src="/lqwvjeImg/76/76b90be196db6f51fd124ed1c6197cc7.png" <br>·<img src="/lqwvjeImg/53/53a0e9196ebbbf5e1d396a7be32a88e5.png" ><br>·<img src="/lqwvjeImg/b8/b80b83cb579213c84ea226dc4493f0d4.png" <br>·<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1697709453957c7cdff0f943c4da5a312ab01245ad2dbimage11.png"

下图示的三铰刚架受力

作用,则

支座反力的大小为( )。

·<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1697709453957c7cdff0f943c4da5a312ab01245ad2dbimage11.png"

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