题目内容

At last Mr. Smith decided to put up a new notice. What did it look like ______

A. [A] It had the right color.
B. It had the word "police" on it.
C. It looked just like a police notice.

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设二维随机变量(X，Y)在区域D：0＜x＜1，|y|=x内服从均匀分布，求关于X的边缘概率密度函数及随机变量Z=2X+1的方差D(Z)．

When will the match begin

At 1:50.
B. At 2:10.
C. At 2:20.

肾盂肾炎最常见的致病菌是

A. 粪链球菌
B. 大肠杆菌
C. 副大肠杆菌
D. 铜绿假单胞菌
E. 葡萄球菌

What is the man’s favorite color

A. Blue.
Black.
C. Brown.