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【简答题】
在 “ 联合国国际贸易标准分类 ” 中 , 一般把 0 至 4 类商品称为 , 把 5 到 8 类商品称为 。
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举一反三
【简答题】肾脏的内分泌功能之一是分泌 A.促红细胞生成素 B.促白细胞生成素 C.促血小板生成素 D.以上都是
【单选题】促红细胞生成素(EPO)基因能在大肠杆菌中表达，但却不能用大肠杆菌工程菌生产人促红细胞生成素，这是因为( )。
A.
人EPO对大肠杆菌有毒性作用
B.
人EPO在大肠杆菌中不稳定
C.
大肠杆菌内毒素与人EPO特异性结合并使其灭活
D.
人EPO对大肠杆菌蛋白水解酶极为敏感
E.
大肠杆菌不能使人EPO糖基化
【单选题】Task 2 Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered 41 through 45. The often criticized child of the industrial age, advertising has grown as soci...
A.
People think highly of advertising.
B.
People criticize advertising.
C.
Some people welcome advertising while others don't.
D.
There are more criticisms of advertising than praises.
【单选题】Task 2 Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered 41 through 45. The most important thing when honoring guests from foreign countries is to acce...
A.
saying hello to them whenever you meet them
B.
accepting and understanding their different cultures
C.
sharing happiness and hardship with them
D.
helping them get what they hope for
【多选题】促红细胞生成素是( )。
A.
通过特异受体作用于红系集落形成单位
B.
它是红系集落形成单位生存和增殖的必需条件
C.
它主要产生于肾髓质
D.
肝也能产生一部分
E.
它是一种酸性糖蛋白
【简答题】关于移动学习的内涵，下列说法正确的是: A. 是在数字化学习的基础上发展起来的 B. 学习者不再被限制在电脑桌前 C. 可以自由自在、随时随地进行不同目的、不同方式的学习 D. 学习环境是移动的，教师、研究人员、技术人员和学生都是移动的
【单选题】Task 2 Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered 41 through 45. Self-esteem is a private, individual matter. It goes up and down from day to da...
A.
kept as it is for a long time
B.
not fixed
C.
easy to improve
D.
the most important
【单选题】Task 2 Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered 41 through 45. Cambridge University provides opportunities for educational achievement which a...
A.
where students can extend their mastery of a major
B.
where students can learn a practical skill
C.
where only the rich students can go for study
D.
whose admission standard is low
相关题目：
【多选题】促红细胞生成素是( )。
A.
通过特异受体作用于红系集落形成单位
B.
它是红系集落形成单位生存和增殖的必需条件
C.
它主要产生于肾髓质
D.
肝也能产生一部分
E.
它是一种酸性糖蛋白
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