【单选题】【消耗次数:1】
平面汇交力系平衡时,合力是()
R=0
R0
R0
不确定
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相关题目
【单选题】 设 R={0,10,20,31,21,32,3},则关系R在{0,1}上的限制R?{0,1}等于:
①  {0,20,31,3
②  {1,02,03,02,13,13,2
③  {0,10,20,31,21,3
④  {2,3}.
【单选题】 指令MOV R0, 20H执行前(R0)=30H,(20H)=38H,执行后(R0)=( ) 。
①  工作寄存器R0~R7  
②  专用寄存器SFR  
③  程序存贮器ROM
④  片内RAM的20H~2FH安节中的所有位和部分专用寄存器SFR的位
【简答题】 设 R={0,10,20,31,21,32,3},求关系R在{0,1}上的限制R?{0,1}。
【简答题】 设 R={0,10,20,31,21,32,3},则关系R在{0,1}上的限制R?{0,1}等于:[填空1]
【判断题】 结构的功能函数(状态方程)R-S=0,表明结构处于不确定状态。
①  正确
②  错误
【判断题】 r>0表示正相关。
①  正确
②  错误
【单选题】 设 R={0,10,20,31,21,32,3},则关系R的二次合成R○R等于:
①  {0,20,31,3
②  {1,02,03,02,13,13,2
③  {0,10,20,31,21,3
④  {2,3}.
【单选题】 当相关系数r=0时,表明?
①  现象之间完全无关
②  相关程度较小
③  现象之间完全相关
④  无直线相关关系
【判断题】 若n元齐次方程组Ax=0与Bx=0同解,则R(A)=R(B).
①  正确
②  错误
【单选题】 平面汇交力系独立的平衡方程数目是( )。
①  一个
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③  两个
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随机题目
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【单选题】 ______ is Edwin Arlington Robinson’s best character sketch telling the story of the well-educated and rich hero who is admired by the town people but suddenly shot himself on one night.
①  “MiniverCheevy”
②  “Richard Cory”
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①  正确
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①  正确
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①  正确
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【单选题】 In Henry James’ The Portrait of A Lady, the author tries to portray the young woman as an embodiment of ______.
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【单选题】 In his masterpiece The Portrait of A Lady, Henry James _________.
①  incarnates the clash between the Old World and the New in the life journey of an American girl in a European cultural environment
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①  the English Renaissance
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