【单选题】James had often been _____ his older brother Jack.
【单选题】从键盘上输入18,执行下列代码程序运行结果是___________number=eval(input("Enter an integer:")if number%2==0 and number%3==0: print(number,"is divisible by 2 and 3")if number%2==0 or number%3==0: print(number,"is divisible ...
A.
18 is divisible by 2 and 3
B.
18 is divisible by 2 or 3
C.
18 is divisible by 2 and 3 18 is divisible by 2 or 3
D.
18 is divisible by 2 or 3,but not both
E.
18 is divisible by 2 and 3 18 is divisible by 2 or 3 18 is divisible by 2 or 3,but not both
【简答题】设(X,Y)是二维连续型随机变量,h(y)=E(X|Y=y)是X的条件分布的数学期望,求证:对于任意连续函数g(y),有 E[(X-h(Y)] 2 ≤E[X-g(Y)] 2 .
【判断题】当行星齿轮机构中的太阳齿轮、齿圈或行星架都不被锁止时,则会形成空档。
【单选题】G72指令是端面粗加工复合循环指令,下刀是沿( )方向的。
【单选题】下面关于电子商务产生的原因叙述不正确的是 ( ) 。
【单选题】There had been black anchors and contributors on TV — Bryant Gumbel and James Brown come to mind .