已经取得中级统计师专业技术职务资格的人员，则无需再持有统计从业资格证书，可直接从事统

New rules and behavior standards(行为规范) for middle school students came out in March. The Middle School is going to use a new way to decide who the top students are. The best students won’t only have high marks. They should not (染) their hair, smoke or drink because they are students. The following are some of the new rules.
Have you ever copied someone else’s work in an exam Don’t do that again! That’s not something an honest student should do.
Do more at school. Good students love animals and care for other people. April is Bird-loving Month in China. Is your school doing anything to celebrate it You should join! And you can learn more about animals and how to protect them. Be friendly to the people around you. Try to think of others, not only yourself.
Be open to new ideas. Do you think people can live on the moon7 Maybe you’ll find another earth someday. Don’t look down on new ideas. Everyone’s ideas are important. You should welcome them, because new ideas make life better for everyone.
Protect yourself. Has someone ever taken money from one of your classmates Don’t let it happen to you. If you have to go home late, you should let your parents know.
Use the Internet carefully. The Internet can be very useful for students. But some things on the Internet aren’t for children, so try to look at web pages (网页) that are good for you.

Good web pages for children can ______.

A．be a waste of time

B．help them with their studies

C．do homework for them

D．make life difficult

定值电阻R₁和R₂分别标有“10Ω  1A”和“20Ω  0.3A”的字样，现将它们串联起来接到某电源两端，为了不损坏电阻，该电源电压不能超过______V；若将它们并联起来，在不损坏电阻的情况下，干路上最大电流是______A．

消防安全通用绳具有阻燃、耐腐、耐磨、柔软等性能，直径为（）。

A.2-15mm

B.3-15mm

C.4-15mm

D.6-15mm

至少每年由授权的人员对空气呼吸器进行一次目检和性能测试。但在使用频率高或使用条件比较恶劣时，则应缩短定期测试的时间间隔。与呼吸器配套使用的气瓶，必须通过由国家质量技术监督局授权的检验机构进行的定期检验与评定。

期货公司以期货交易软件、终端设备为载体，向客户提供交易咨询服务或者具有类似功能服务的，应当向客户说明交易软件、终端设备的基本功能，揭示使用局限性，说明相关数据信息来源，不得对交易软件、终端设备的使用价值或功能做出虚假、误导性宣传（）