开机前应拉开所有离合器，（）带负荷启动。 A.可以 B.严禁 C.一定

阅读理解。

Dear Wang Jun, 

    My name is Jack Smith. I come from Ottawa. I'm a schoolboy. I know China is a great (伟大的) country.

I want to make friends with Chinese children. So I must (必须) learn Chinese well first.

    There are eighteen students in my class. They are from five countries. They are learning English here. Three

boys are from France. They speak French. There are two Chinese girls in my class. Now they can speak some

English. One girl's name is Xu Yan. Sometimes (有时) I call her "Miss Yan." You know I'm wrong. You don't

put your family name second. I want to have some Chinese books. Can you help me?

    Please write to me soon. 

                                                                                                                                            Yours, 

                                                                                                                                            Jack Smith

1. Jack is from ______. [ ]

A. Canada

B. Australia

C. the U.S.

D. China

2. The word "schoolboy" here means (意思是) "______". [ ]

A. 保姆

B. 教师

C. 男生

D. 朋友

3. Now the two Chinese girls can speak ______. [ ]

A. only Chinese

B. only English

C. French and Chinese

D. Chinese and English

4. We should (应该) call Xu Yan "______". [ ]

A. Mr. Xu

B. Miss Yan

C. Miss Xu

D. Mrs. Xu

5. In Jack's class, most students can speak ______ language (语言). [ ]

A. one

B. two

C. three

D. four

Ficoll分层液主要用于分离外周血中的单个核细胞，是一种（）。

A.聚合物加速沉淀分离法

B.聚合物不加速沉淀分离法

C.多次密度梯度离心分离法

D.单次密度梯度离心分离法

E.连续密度梯度离心分离法

《建设工程检测试验管理规程》第4.6条规定：检测试验机构在试样（件）的接受存放和检测过程中，应对试样（件）做出（）标识。

A.清晰

B.完整

C.牢固

D.唯一性

《儿童权利宣言》提出了各国儿童应当享有的各项基本权利，具有法律约束力。

ZM（自定义）施工代码的工时确认，应由（）在工单上进行签字确认才有效。

A.售后服务经理

B.车间主管

C.保修员

D.服务顾问

E.维修技师