—What______ that ship look like? —It ____爱下问搜题

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问题选择题

—What______ that ship look like?

—It ______like a fish, I think.[ ]

A. is, looks

B. is, is

C. does, looked

D. does, is

答案

答案：D

填空题

在□里填上适当的数。

6.29+4.87+3.71=6.29+□+□

8.11-0.73+1.89-2.27=8.11+□-（□+□）

单项选择题

设X₁，X₂，…，X_n是来自X～P(λ)的简单随机样本，则统计量

的数学期望E(T)=

A．λ²．
B．λ(λ-1)．
C．λ²-1．
D．λ．