【简答题】【消耗次数:1】
过原点(0,0,0)且垂直于向量(1,1,1)的平面方程为[填空]
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相关题目
【简答题】 过点M(1,2,3)且与平面2x—Y+z=0平行的平面方程为[填空]
【单选题】 表达式(12==0) && (1/0 < 1)的值为( ) 。
①  true
②  false
③  0
④  运行时抛出异常
【判断题】 用厚度属性拉伸的平面只能是垂直于X0Y平面的面。
①  正确
②  错误
【单选题】 点(1,1,1)关于平面的对称点是()
①  (-1,1,1)
②  (-1,-1,-1)
③  (1,1,-1)
④  (1,-1,1)
【单选题】 设M={x|f1(x)=0},N={x|f2(x)=0},则方程f1(x)·f2(x)=0的解为(   )
①  M∩N
②  M∪N
③  MN
④  M-N
【判断题】 若一个样本的观察值为0,0,1,1,0,1,则总体均值的矩估计值为1/2。
①  正确
②  错误
【单选题】 设0,1,0,1,1为来自总体B(1,p)的样本观测值,则p的矩估计值为
①  1/5
②  2/5
③  3/5
④  4/5
【判断题】 “有0出1,全1为0”是与非运算的运算规则。
①  正确
②  错误
【单选题】 已知x0,y0,且x+y=8,则(1+x)(1+y)的最大值为(  )
①  25
②  16
③  36
④  9
【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]
随机题目
【单选题】 I can always ( ) her from far away by the way she walks.
①  recognize
②  realize
③  authorize
④  socialize
【单选题】 There is a number here to call ( ) an emergency.
①  only to
②  in case of
③  in return for
④  in addition to
【单选题】 I couldn’t ( ) more with your excellent taste of music.
①  refuse
②  accept
③  replace
④  agree
【单选题】 ( ) relationships in happy families can create much pleasure.
①  Principal
②  Intimate
③  Mythical
④  Replaceable
【单选题】 They had been married for a long time but gradually ( ) until they separated.
①  drifted into
②  drifted apart
③  drifted along
④  drifted about
【单选题】 The story Alisa told on balcony is ( ) over.
①  far from
②  far away
③  beyond
④  further from
【单选题】 The test is ( ) to the one your brother took last year.
①  identity
②  different
③  identical
④  intimate
【单选题】 The man went out to the woods to escape from his busy life and get some ( ).
①  lonely
②  safeguard
③  solitude
④  secure
【单选题】 Cut the ( ) at a 45 degree angle so that the roses can take in more water.
①  flowers
②  stems
③  fruits
④  buds
【单选题】 The young man ( ) the food within a well-sealed container.
①  attracted
②  replaced
③  enclosed
④  browsed