第9题: [单项选择]剪应力互等定理仅适用于( )。 A. 线弹性范围 B. 纯剪切应力状态 C. 受剪切的构件 D. 单元体上两个相互垂直平面上的剪应力分析 参考答案:D 答案解析:[解析] 剪应力互等定理是指在互相垂直的两个平面上，垂直于两平面交线的剪应力，总是大小相等，而方向则均指向或离开该交线，即：τ=τ'。
第26题: [单项选择](Although) the wages for all the members of the working staff (increase regularly), so (their expenses do); for the prices for everything (are increasing dramatically) at the same time. A. Although B. increase regularly C. their expenses do D. are increasing dramatically 参考答案:C 答案解析:应改为do their expenses，与前面so联系起来，表示“……也……”。
