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多项选择题

学术研究中,最基本的伦理有哪些( )。 A.
自愿参与 B.
匿名与保密 C.
不欺骗 D.
对参与者无害

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单项选择题
Whether you’re headed to another country for business or pleasure, it is likely that you need to keep in touch with family or business partners in the United States. But if you plan to do that using your cell phone, you could have an unwelcome surprise-U.S. cell phones don’t work abroad. U.S. companies use different forms of technology, not like most of the international community, including Europe.
However, there is an easy, cost-effective solution(方法) to staying in touch while you’re traveling. You Can rent a phone that is guaranteed to work in the countries you’re visiting. Roadpost offers a 30-day cell phone rental plan that includes free incoming calls, free voicemail and call waiting services.
The service is convenient and simple. You can place your order online and your phone will be shipped to arrive on the date you want. If an unexpected business trip comes up, Roadpost can provide next-day delivery for most cities. In addition to the phone, Roadpost provides a spare battery, travel charger and a leather carrying case.
When your phone is shipped from Roadpost, you receive an e-mail confirmation that contains your international cell phone number so you can leave it with family members and business partners; Roadpost even provides business cards preprinted with your international phone number.
Those who don’t want to be without e-mail while traveling can rent an international BlackBerry. It can be hard to stay in touch by e-mail when traveling. With an international BlackBerry, you can email as much as you like, without worrying about an expensive bill. If you’re traveling to very remote areas, you may want to consider renting a satellite phone: Because they receive their signals from satellites, these phones work anywhere on the planet, including oceans and mountains. When you return, simply ship the phone or BlackBerry back to Roadpost using the return kit the company provides. A. The birth rates all over the world are becoming smaller. B. The most developed countries have higher death rates. C. America is the only developed country with higher birth rate. D. Birth rate’s becoming smaller means a great risk to aging countries.
单项选择题
主要施工机具的需要量，根据施工总进度计划、主要建筑物的施工方案和工程量，并套用(         )定额求得。
A、企业劳动
B、企业机械产量
C、地方统一预算
D、国家统一劳动
单项选择题
在pH值为10.0的氨性溶液中，，，已知lgK（ZnY）=16.5，则在此条件下lgk'(ZnY)为（    ）。
A、11.3
B、8.9
C、11.8
D、14.3
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