耦合强度

已知集合A={1，2，3}，B={2，3，4}，那么集合A∩B等于 [ ]

A.{2}

B.{2，3}

C.{1，2，3}

D.{1，2，3，4}

Passage Two

Which of the following factors did NOT contribute to the sea disaster

A．Andrea Doria was not very far from other ships.

B．It was dark and foggy.

C．Andrea Doria was going at a fast speed.

D．Andrea Doria’s killer had an ice-breaker like bow.

为巩固统一，加强各地的经济文化交流，秦朝统一了文字。规定在全国范围内统一使用的文字是[ ]

A．大篆

B．小篆

C．隶书

D．楷书

两样本率比较可用Z检验的条件是

A．两个样本率的差别大

B．两个样本率的差别小

C．两个样本率均较大

D．两个样本率均较小

E．两个样本含量均较大，且两个样本率均不接近0也不接近1

阐述蚕的温度影响。