【单选题】【消耗次数：1】
由于静定结构内力仅由平衡条件决定，故在温度改变作用下静定结构将（）。
①
产生内力
②
不产生内力
③
产生内力和位移
④
不产生内力和位移
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超静定结构在荷载作用下的内力和位移计算中，各杆的刚度为（）。
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