列控双系同步时,主备系设备向外部设备的主备系发送相同的应用数据,但备系数据仅用于通道

题型:判断题

问题:

列控双系同步时,主备系设备向外部设备的主备系发送相同的应用数据,但备系数据仅用于通道检查。

考点:车站电子设备作业指导考试车站电子设备作业指导考试题库
题型:判断题

缺词填空(共10空;每空l分,计l0分)

根据短文内容和首字母提示,在下文空格处填入适当的词使短文完整。(每空一词)

At last, the mid-term exams are over. You’ve done the hard work, 小题1: you can’t relax. You have to prepare for the next exams. Do you hate exams? If you do, you’re not alone. Students in 小题2: countries hate them as well.

Luckily for them, British students have 小题3:  exams than Chinese students. And they 小题4:have them once a year. Every summer they take a test in each subject. Each test lasts about an hour. These exams don’t count for much. Even if a student does really 小题5: they still progress to the next year. When the results come out they are then placed in an end-of-year report. The report is sent to the child’s 小题6: . It describes how the student studied at school.

This report is private(私密的), so only the teacher, the student and his or her parents see it. This 小题7:  that the students don’t know how other students scored in the test. Some students choose to tell each other, but others keep it 小题8: .

Parents’ meetings are held t 小题9: a year, at the end of the winter term and then at the end of the summer term. Children go to meet their teachers 小题10: their parents and discuss their performance at school.

题型:判断题

现取m克铝镁合金与一定浓度的稀硝酸恰好完全溶解(假定硝酸的还原产物只有NO),向反应后的混合溶液中滴加amol/LNaOH溶液,当滴加到VmL时,得到沉淀质量恰好为最大值n克,则下列有关该实验的说法中正确的有(   )

①沉淀中氢氧根的质量为(n-m)克

②恰好溶解后溶液中的NO3-离子的物质的量为mol

③反应过程中转移的电子数为mol

④生成NO气体的体积为L

⑤与合金反应反应的硝酸的物质的量为()mol

A.2项

B.3项

C.4项

D.5项

题型:判断题

根据下面表中提供的信息,分析我国耕地、人口、粮食三者的变化情况,回答问题()。

A.时间;项目

B.人口

C.人均耕地

D.人均粮食占有量

E.粮食产量

F.1949年

G.5.4亿

H.3亩

I.204千克

J.11318万吨

K.1990年

L.11.3亿

M.1.3亩

N.387千克

O.43500万吨

题型:判断题

弹簧--物块直线振动系统位于铅垂面内。弹簧刚度系数为K,物块质量为m。若已知物块的运动微分方程为m+=0,则描述运动的坐标o的坐标原点应为()。

A.弹簧悬挂处之点o1

B.弹簧原长0处之点o2

C.弹簧由物块重力引起静伸长δst之点o3

D.任意点皆可

题型:判断题

某商场为招揽顾客,推出转盘抽奖活动。如下图所示,两个数字转盘上的指针都可以转动,且可以保证指针转到盘面上的任意数字的机会都是相等的。顾客只要同时转动两个转盘,当盘面停下后,指针所指的数相乘为奇数即可获得商场提供的奖品,则顾客获奖的概率是()。

A.

B.

C.

D.

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