【单选题】【消耗次数:1】
平面任意力系的平衡方程也可取二力矩式和三力矩式。( )
正确
错误
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相关题目
【单选题】 平面一般力系的二力矩式平衡方程的附加使用条件是( )。
①  二个矩心连线与投影轴无关
②  投影轴通边一个矩心
③  二个矩心连线与投影轴垂直
④  二个矩心连线与投影轴不垂直
【单选题】 平面一般力系的三力矩式平衡方程的附加使用条件是( )。
①  三个矩心不共线
②  投影轴通边一个矩心
③  二个矩心连线与投影轴垂直
④  二个矩心连线与投影轴不垂直
【单选题】 平面任意力系的独立的平衡方程的数目分别为()。
①  1,2,3
②  2,2,3
③  2,1,3
④  2,3,2
【多选题】 平面一般力系的平衡方程是()
①  所有力在X轴上投影的代数和为零
②  所有力在Y轴上投影的代数和为零
③  所有力对矩心的力矩之和为零
【单选题】 平面汇交力系独立的平衡方程数目是( )。
①  一个
②  三个
③  两个
④  四个
【判断题】 结点不平衡力矩可通过结点的力矩平衡条件求出。
①  正确
②  错误
【单选题】 平面汇交力系最多可列出的独立平衡方程数为(   )
①  2个
②  3个
③  4个
④  6个
【单选题】 平面汇交力系最多可列出的独立平衡方程数为()。
①  2个
②  3个
③  4个
④  6个
【单选题】 平面一般力系的平衡方程一般有()个。
①  1
②  2
③  3
④  4
【判断题】 在平面力系中,所有力作用线汇交于一点的力系,称为平面一般力系,有3个平衡方程。
①  正确
②  错误
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③  Very much.
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①  whomever
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①  nearly
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①  a
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①  whats more ?
②  in addition?
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【单选题】 He’s never again written ____ as his first one.
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①  strange ?
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