关于合同变更，下列说法错误的是( )。A．协商一致是必要条件 B．仅指合同内容的变

T细胞亚群分离时，可同时进行阳性分选和阴性分选的方法有（）

A.E花环沉降法

B.尼龙毛柱分离法

C.亲和板结合分离法有

D.免疫磁珠分离法

E.流式细胞术分离法

根据对话内容,在空白处填上合适的句子使对话完整。

A: Say, Paul. Did you have a vacation?

B: Yeah. We had three days off.

A: Wow. That sounds cool. What did you do during the vacation?

B: I read a book about Li Yundi.

A: __1__

B: I read it for a whole day.

A: __2__

B: That's right. I admire him very much. He is a talented pianist. He is the first Chinese pianist to win the

     first prize at the International Chopin Piano Competition. People call him the Chopin in China.

A: __3__

B: He was born in 1982.

A: __4__

B: He started to play the piano at the age of seven. And he won the first prize at national and international

     competitions when he was only nine.

A: So we are never too young to start doing things.

B: I think so. By the way, __5__

A: I'm going to be a reporter.

男孩，11月龄，因咳嗽、发热9d，抽搐3次入院。体格检查：发育中，颈软，面色灰，唇绀色，面肌、四肢小抽动，前囟紧，双肺闻干湿啰音，心率146/min，肝肋下3cm，软，脾未及，神经系统(-)。血白细胞 7.2×10/L，中性0.35，淋巴0.65。

最有助于抽搐原因诊断的方法是

A．头颅CT检查

B．脑电图检查

C．头颅B超检查

D．脑脊液常规检查

E．血钙磷测定

全口义齿排牙时，下颌第二磨牙的远中应不超过

A．磨牙后垫前缘
B．磨牙后垫后缘
C．磨牙后垫前1/2
D．磨牙后垫中1/3
E．磨牙后垫后1/3

一个项目具有一个项目主管，一个项目主管可管理多个项目，则实体“项目主管”与实体项目”的联系属于 【4】 的联系。