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【单选题】
某溶液的c(H+)为6.2×10-4 mol/L, 则该溶液的pH为：A.
3
B.
3.21
C.
3.2
D.
3.207
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反馈参考答案：
举一反三
【简答题】DNA重组技术中,常用的载体按功能分为克隆载体和()。
【单选题】Questions 19 to 21 are based on the passage you have just heard 19
A.
How much you can afford to pay.
B.
What course you are going to choose.
C.
Which university you are going to apply to
D.
When you are going to submit your application.
【单选题】商陆药材的断面特征是（ ）
A.
髓部异常复合维管束的形成层成环，其射线呈星状射出
B.
皮部有4～11个类圆形异常复合维管束环列
C.
黄白色小点排列成数轮同心环
D.
木部隆起，形成多个凸起的同心性环轮
E.
朱砂点
【简答题】questions 19 to 21 are based on the second passage
【单选题】Questions 19 to 21 are based on the following passage. 21.
A.
A robot that plays the hero.
B.
A robot that wants to take over the world.
C.
The oldest robot in the Star Wars movies.
D.
The newest robot in the Star Wars movies.
【单选题】Questions 19 to 21 are based on the following passage. 19.
A.
Arnold Schwarzenegger.
B.
Arnold Beckman.
C.
Benedict Arnold.
D.
Tom Arnold.
【单选题】命名空间是一种在程序中防止标识符命名冲突而引入的逻辑隔离机制,C#中使用关键字______表示
A.
using
B.
namespace
C.
protected
D.
private
【单选题】Questions 19 to 21 are based on the passage you have just heard. Questions 19
A.
He is self-employed.
B.
He is a career advisor.
C.
He studies talent.
D.
He owns a magazine
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