可用作电位鉴别的电路是()电路。 A.单稳触发器 B.施密特触发器 C.多谐振荡器

题型:单项选择题

问题:

可用作电位鉴别的电路是()电路。

A.单稳触发器

B.施密特触发器

C.多谐振荡器

D.积分

考点:电梯行业特有工种电梯维修工(高级)电梯维修工(高级)题库
题型:单项选择题

Starting high school means many changes in your life.Most teenagers look forward to the first day of high school,but still feel a little bit nervous.In order to make your high school life easier, you can follow these tips.

Learn all you can about your first day before the first day.Take part in some activities that are held at the school for new students to know the school better.If parents are invited to these activities, take yours with you.Carefully look over all the materials you receive.Be sure you know where the school’s buildings are.

Get the things you will need for class.Buy the things suggested on your teachers’ supply lists and place your materials for each class separately.

Keep up with your high school workload(工作量).If you fmd you’re not doing well in a subject,make use of after-school study groups or ask your teacher to help you with your schoolwork.Consider private tutoring to get you through a difficult time.

There’re more extracurricular(课外的)activities in high school than in middle school,such as clubs,music and theater groups,student government,and sports teams. Make friends and be seen at such school activities.Join a club or other organizations to meet people and develop friendships.Ask someone in school activities if you don’t know how.This is a good time to do what you like doing and an opportunity to try new things.Whe said school has to be aH work and no play?

Since you’ll attend more activities in high school than in middle school,you’ll have to learn how to manage your time.

小题1: The writer wrote this passage to        .

A.advise us to study hard in high school

B.tell us how to live an easier life in high school

C.show that we may live a hard life in high school

D.explain why there will be many changes in high school小题2: In Paragraph 2,the writer suggests that we should      

A.ask our parents to walk us to school

B.ask other students about our high school

C.prepare all the things we need for our classes

D.1earn about our high school well before attending it小题3: According to Paragraph 4,what should we do if we are not doing well in a subject?

A.We should get help from others.

B.We should stop going to activities.

C.We should spend most of our time on it.

D.We should give it up if it is not important.小题4: In Paragraph 5.the writer wants to tell us that   

A.every coin has two sides

B.the early bird catches the worm

C.where there is a will, there is a way

D.all work and no play makes Jack a dull boy小题5: What will the Writer most probably talk about next?

A.How to manage time well in high school.

B.Why we need to learn how to manage time.

C.How to attend more activities in high school.

D.Why middle school is difierent from high school.

题型:单项选择题

( ) 属于第三层VPN 协议。

A.TCP

B.IPsec

C.PPOE

D.SSL

题型:单项选择题

居住人口密度是指()。

A.居住人数/居住建筑用地面积

B.居住人数/总用地面积

C.居住人数/居住建筑面积

D.都不对

题型:单项选择题

慢性肺心病急性加重期的最常见诱因是()

A.大量利尿

B.过劳

C.使用镇静剂

D.呼吸道感染

E.使用支气管扩张剂

题型:单项选择题

甲企业设机关部门4个,员工24人;生产车间6份,员工450人;辅助车间1个,员工26人。员工每天工作8小时,全年工作日数300天。2012年,甲企业发生各类生产安全事故3起,2名员工死亡。甲企业2012年百万工日死亡率为()。

A.2.06

B.1.75

C.1.67

D.1.53

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