【单选题】在( ),导游领队应将文明旅游事项向旅游者进行重申。
【单选题】以下叙述中正确的是
A.
只有全局变量才有自己的作用域,函数中的局部变量没有作用域
B.
只要是用户定义的标识符,都有一个有效的作用域
【单选题】某数字通信系统的码元速率为1000Baud,接收端在10分钟内共接收到60个错误码元,则该系统的误码率为
【单选题】设定义域为[x 1 ,x 2 ]的函数y=f(x)的图象为C,图象的两个端点分别为A、B,点O为坐标原点,点M是C上任意一点,向量 OA =(x 1 ,y 1 ), OB =(x 2 ,y 2 ), OM =(x,y),满足x=λx 1 +(1-λ)x 2 (0<λ<1),又有向量 ON =λ OA +(1-λ) OB ,现定义“函数y=f(x)在[x 1 ,x 2 ]上可在标准k下线性近似”是指...
【简答题】Look at this, please. It's __ 1 ___ my family. ___2___ man and the woman ___3___ the middle is my father and mother. On the left(左边) is my ___4___ Mike. And the girl on the right(右...
【单选题】回归预测一般步骤是: (1)获取自变量和因变量的观测值 (2)初步判断自变量与因变量的函数关系,写出带未知参数的回归方程。 (3)绘制观测值的X、Y散点图;对于多个自变量,则须分别针对每一个自变量绘制X、Y散点图。 (4)用所得到的回归方程和给定的自变量值计算因变量的预测值;或对于因变量的目标值,利用回归方程求自变量的值。 (5)用最小方差原则,确定回归方程中参数的值,从而得到回归方程。 (6)判...
【单选题】某数字通信系统的码元速率为1200Baud,接收端在半小时内共接收到216个错误码元,则该系统的误码率为
【简答题】my family and my life. It was then when I realized that my friends
【简答题】Thir, for me, was a challenging year. My parents divorced and I moved to a new town with my father, far from my old family and friends. I was terribly lonely and would cry myself to sleep each nig...