对CT机X线管窗口处准直器的叙述，错误的是（） A.选择层厚 B.保证成像质量 C.

下列叙述不正确的是()。

A．在人工管理阶段，数据不保存，但数据可以共享

B．在文件系统阶段，数据叫以长期保存，但数据共享性差，数据独立性差

C．在数据库系统阶段，数据共享性高，独立性高

D．数据库是长期存储在计算机内有组织的大量共享的数据集合

某县服装厂系增值税一般纳税人，2015年6月份发生如下经济业务： （1）购进布料一批，取得增值税专用发票上注明价款300万元、税额51万元；购进生产设备两台，取得增值税专用发票上注明价款20万元、税额3.4万元；取得甲运输公司开具的货物运输业增值税专用发票上注明运费0.5万元、税额0.055万元；购进新建仓库用钢材，取得增值税专用发票上注明价款60万元、税额10.2万元，同时取得乙运输公司开具的货物运输业增值税专用发票上注明运费2万元、税额0.22万元。 （2）本月销售服装，开具增值税专用发票注明价款估计1000万元，该厂门市部直接销售给消费者个人服装，收取现金收入合计11.7万元。 （3）本月将自产新款服装一批交给工会组织作为职工福利，该批服装生产成本25万元，市场不含税售价为40万元。 （4）本月对外临时出租仓库两间，一次性收取租金收入10万元。

该服装厂当月应缴纳营业税（）万元。

A.0

B.0.3

C.0.5

D.0.6

Is there something that you've always wanted to try but just never had the time? Well, make plans to try it now since you are on summer vacation. Not all vacations call for taking a tour bus to take photos of famous landmarks. Some vacations allow you plenty of opportunities to learn.

The most difficult aspect of a learning vacation may be choosing one because the possibilities are endless. If you enjoy cooking, various companies can take you to Italy, France, Spain, Mexico or even Peru. Once there, you can learn to prepare the local cuisine(烹饪). Trips are often planned to fit in with local food festivals or special events.

The term “learning vacation” often brings language to mind. The best way to learn a language is in an environment where it's spoken. Study Spanish, French or English. Or attempt a more unusual language like Polish, Estonian or Thai. You'll be able to learn about the country and absorb the culture at the same time.

If you are fond of sports, you can polish your skills or learn new ones. Golf and tennis schools welcome players of all levels. If you want a bigger thrill, you can learn to surf, go climbing or race cars. It's even possible to learn the art and techniques of bull fighting while on vacation!

You can also discover our inner artist.  Many places offer painting classes in different mediums. The scenic locations, of the schools offer plenty of subjects that provide inspiration for practice.

If you prefer capturing the world on film, take a photography vacation. Travel with a small group to photograph beautiful animals or scenery.  You can also practise your technique on people or at historical sights.

Once you decide on a vacation, choose a company carefully.  Request names of recent customers you can contact,  and then ask them for an evaluation. The more you know before you go,  the better prepared you'll be.  Then go out and learn something!

小题1:Why is it hard for you to decide on a learning vacation?

A．Because it is hard for you to make plans.

B．Because the possibilities are unlimited.

C．Because there are many good foods from abroad.

D．Because there're too many food festivals or events.小题2:The advantage of learning a language in its native country is that ________.

A．the environment is fit for you to use the language

B．you are able to learn the original foreign language

C． native speakers offer you a lot of chances to practise

D．you can learn the language and experience its culture小题3:Which of the following sports suits you if you don't like thrills?

A．Car racing.

B．Playing tennis.

C．Rock climbing.

D．Surfing.

2003年5月，胡某到某市百货商场买照相机，该商场售货员因工作疏忽，错将一架尼康相机价格4500元标成450元。胡某看到这架相机价格便宜而且性能良好，便买了下来。事隔一周后，商场盘点时发现了错误，就派人找到胡某，要求他补足货款或退款退货，而胡某认为标错价是商场的责任，货既然已经卖出，就不能再补钱，也不退货。于是，该百货商场到人民法院起诉，诉称售出此架尼康相机属重大误解的民事行为，请求人民法院予以撤销。
问题：
1.本案中尼康相机的买卖行为是否属于重大误解的民事行为为什么

表面活性剂的一般性质主要依（）离子性质的不同而有所不同。

A、亲水基

B、亲油基

C、自由基

D、羟基