“上品无寒门，下品无士族”说的是我国（）时期的选官制度。

油检法（指电缆潮湿）

在下列溶液中，各组离子一定能够大量共存的是 [ ]

A．使酚酞试液变红的溶液：Na⁺、Cl^-、SO₄^2-、Fe³⁺

B．使紫色石蕊试液变红的溶液：Fe²⁺、Mg²⁺、NO₃^-、Cl^-

C．常温下c(H⁺)=10^-12 mol/L的溶液：K⁺、Ba²⁺、Cl^-、Br^-

D．碳酸氢钠溶液中：K⁺、SO₄^2-、Cl^-、H⁺

给下列句子选择正确的译文。

1. 今天星期几？ [ ]

A. What day is it today?

B. What's the date today?

C. What is it?

2. 今天是星期四。  [ ]

A. It's Tuesday today.

B. It's Thursday today.

C. It's Friday today.

3. 你们星期三有什么课？[ ]

A. What do you have on Wednesdays?

B. What do you do on Wednesdays?

C. Do you like Wednesdays?

4. 他喜欢星期三，因为他喜欢体育课。[ ]

A. He likes Wednesdays, because he likes art class.

B. He likes Wednesdays, he has art class.

C. He likes Wednesdays, because he likes P. E class.

在科目三考试驾驶车辆超车时，超车前不通过内、外后视镜观察后方和左侧交通情况，考试成绩应（）。

A.不合格

B.扣5分

C.扣10分

D.扣20分

香豆素类抗凝药物与（）结构相似

A.V_K

B.V_B

C.V_A

D.V_C

E.V_E