如图所示,A、B为平行金属板,它们之间的距离为d,在A板的缺口的正上方距离为h的

题型:填空题

问题:

如图所示,A、B为平行金属板,它们之间的距离为d,在A板的缺口的正上方距离为h的P处,有一质量为m、带电量为q的液滴由静止开始自由落下,若要使液滴不落在B板上,两板间场强至少为      ,两板间的电势差至少为       

考点:电势
题型:填空题

微球属于()。

A、主动靶向制剂

B、被动靶向制剂

C、物理化学靶向制剂

D、热敏感靶向制剂

题型:填空题

阅读理解。

     Everyone's at it, even my neighbors. I thought I might be the only person left in the world who hadn't done

an eBay deal. So, I decided to try my hand at online auction (网上拍卖). Buying for beginners: Sign up on

www.ebay.co.uk. Most items (e.g. tables, computers, and books) ready for auction will come with a picture

and a short description; others may be marked with"Buy It Now" and have a fixed price. You can buy these

right away.

      If the item is being auctioned, you offer the highest price you are prepared to pay and eBay bids (出价) for

you.The bid will be increased little by little until it goes beyond your highest bid, then you are emailed and asked

if you would like to bid again. Auctions last up to 10 days, and when they finish you get an e-mail telling you

whether you have won the item.

     How to pay: Sellers decide how they would like to be paid and you need to check this before placing a bid

as you might not want to post a cheque or postal orders. The easiest way is through PayPal, an online payment

system that takes the money away form your credit card (信用卡).

     Selling made simple: If you plan to sell on eBay, it helps to include a picture of the item. I followed my

friends' advice and put up the items I wanted to sell for a 10-day auction, starting on a Thursday.

     The big things in life: It's easy to post a small item, but furniture is a big part of eBay and this has to be

collected or sent by deliverymen. Check the ways of delivery before you bid.

1. What is the passage mainly about?

A. How to make payment online.

B. Ways of making delivery online.

C. Advantages of an online auction system.

D. How to use an online-auction system.

2. After bidding for an item, a buyer ______.

A. will get what he wants in ten days

B. should make payment immediately

C. has chances to make higher bids

D. must pay through PayPal

3. The easiest way of making payment mentioned in the passage is _______.

A. through an online payment system

B. through a local banking system

C. by sending the money to the seller

D. by paying the deliveryman directly

4. Which of the following is Not right according to the passage?

A. An eBay deal is popular with people.

B. You can see pictures, accounts and prices for most items ready for auction online.

C. Everything you want to buy can be sent by post.

D. Online auctions usually last up to 10 days.

题型:填空题

最不可靠的验证病因的方法是()

A.现况研究

B.病例对照研究

C.队列研究

D.现场实验

E.临床实验

题型:填空题

针对游客不合理的个别要求,导游员应()。

A、请求领导汇报,请求协助

B、请全陪或领队出面协助解决

C、请全体游客主持公道

D、坚持不卑不亢的原则,采取有理、有利、有节的方式

题型:填空题

“黄英参加会议,周明也参加会议”和“要么黄英参加会议,要么周明参加会议”这两个判断()。

A.可同真,可同假

B.可同真,不可同假

C.不可同真不可同假

D.可同假不可同真

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