来自正态且具有方差齐性总体的多个样本均数间做两两比较时，不直接做检验是因为

A．检验计算量大

B．增大犯第二类错误的概率

C．增大犯第一类错误的概率

D．样本方差不相等

E．样本含量不一定相等

For each blank，choose the best answer from the four choices and write down on the answer sheet．

(1) is a protocol that a host uses to inform a router when it joins or leaves an Internet multicast group．

(2) is an error detection code that most data communication networks use．

(3) is an interior gateway protocol that uses a distance vector algorithm to propagate routing information．

(4) is a transfer mode in which all types of information are organized into fixed form cells on an asynchronous or non -periodic basis over a range of media.

(5) is an identifier of a web page.

4（）

A．ADSL

B．ATM

C．Frame Relay

D．DDN