【单选题】【消耗次数：1】
He __________ five telephone calls to his parents.
①
makes
②
was made
③
has made
④
was making
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相关题目
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to cry; to cry
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【单选题】
关于力法的描述正确的是（）。
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将全部多余约束去掉得到的静定结构为力法基本结构
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根据原结构的受力条件而建立的位移方程称力法基本方程
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根据转角位移方程可知（）。
①
已知杆端位移就一定能够确定杆端力
②
在没有刚体位移时，已知杆端位移才能确定杆端力
③
已知杆端力就可以确定杆端位移
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即使已知刚体位移，知道了杆端力也不能唯一确定杆端位移
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关于力法的描述正确的是（）。
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主系数满足位移互等定理
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柔度系数与外界因素有关
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荷载作用时，内力分布与绝对刚度大小无关
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位移典型方程中的系数是（）。
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单位位移引起的杆端力或杆端弯矩
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单位位移引起的附加联系的反力或反力矩
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单位荷载引起的杆端力或杆端弯矩
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单位荷载引起的附加联系的反力或反力矩