石膏的主要化学成分是A.硫化汞 B.含水硅酸镁 C.含水硫酸钙 D.碳酸锌 E.二硫

题型:单项选择题

问题:

石膏的主要化学成分是

A.硫化汞

B.含水硅酸镁

C.含水硫酸钙

D.碳酸锌

E.二硫化二砷

考点:中药执业药师中药学专业知识(二)中药执业药师中药学专业知识(二)
题型:单项选择题

This is a photo of Ben’s family. He has a big family. Look! Ben’s grandparents are on the sofa. They are workers. They are old, so they don’t work now. Ben’s father is a doctor. He works in a hospital. He often drives his car to work. Ben’s mother is a teacher. She teaches English in our school. The man in white is Ben’s uncle. The young woman in red is Ben’s aunt. They are office workers. Ben’s family live in Beijing now. Ben and I are classmates. We are good friends.

根据短文内容,选择正确答案。

小题1:What does Ben’s grandfather do?

A.A doctor.

B.A teacher.

C.A farmer.

D.A worker.小题2:What do Ben’s parents do?

A.They’re doctors.

B.They’re teachers.

C.His father is a doctor and his mother is a teacher.

D.His father is a teacher and his mother is a doctor.小题3:Where do Ben’s uncle and aunt work?

A.In an office.

B.On a farm.

C.In a hospital.

D.In a school.小题4:Where do Ben’s family live now?

A.In Canada.

B.In China.

C.In England.

D.In America.小题5:Which of the following is NOT true?(下面哪一个选项不正确)

A.Ben’s family is big.

B.Ben and I are in the same class.

C.Ben’s mother is my Chinese teacher.

D.Ben’s aunt is in red in the photo.

题型:单项选择题
已知双曲线的中心在原点,焦点F1,F2在x轴上,准线方程为x=±
1
2
,渐近线为y=±
3
x

(1)求双曲线的方程;
(2)若A、B分别为双曲线的左、右顶点,双曲线的弦PQ垂直于x轴,求直线AP与BQ的交点M的轨迹方程.
题型:单项选择题

企业合并后仍维持其独立法人资格继续经营的,为()。

A.吸收合并

B.控股合并

C.新设合并

D.股票兑换

题型:单项选择题

阅读以下关于中断的叙述,回答问题1至问题4,将答案填入答题纸的对应栏内。

【说明】

在某嵌入式系统中。王工设计的计算机模块如图4-1所示。它要求CPU在执行完当前指令后转而对中断请求进行处理。假定:TDC为查询链中每个设备的延迟时间,Ta、Tb、Tc分别为A、B、C的中断服务程序所需的执行时间,TS和TR为保存现场和恢复现场所需的时间。

【问题1】

一般计算机系统根据对中断处理的策略不同,可分为单级中断系统和多级中断系统。本项目中王工设计的系统属于哪一类中断系统?请将设备A、设备B、设备C三个设备的中断优先级按照从高到低的次序排列。

题型:单项选择题

资本金账户的最高限额为()。

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