图示结构的超静定次数是( )次。<img src="data:image/png;base64,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" ><br>·3<br>·4<br>·5<br>·6

图示结构的超静定次数是( )次。<img src="data:image/png;base64,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" >
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出自：佳木斯大学语言治疗学

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