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(4.<的答案

(4.1支座的支座反力FRB =  )(4分)

多选题
2021-07-17 19:05
<span lang、"EN-US">10kN </span><span>(</span><span lang="EN-US">↓</span><span>)</span>
<span lang、"EN-US">18kN</span><span>(</span><span lang="EN-US">↑</span><span>)</span>
<span lang、"EN-US">20kN</span><span>(</span><span lang="EN-US">↑</span><span>)</span>
<span lang、"EN-US">2kN</span><span>(</span><span lang="EN-US">↓</span><span>)</span>
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正确答案
18kN

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