防腐工程量计算规定：设备及管道的表面除锈、刷油以（）为单位。 A．“kg” B．“m

植物园上午有游客935人，中午有357人离去，下午又来了397人，这时园内有游客多少人？

1990年5月，中国紫金山天文台将1965年9月20日发现的第2752号小行星命名为吴健雄星，其直径为32 km。若该行星的密度和地球的密度相同，则对该小行星而言，第一宇宙速度为多少？(已知地球半径R₁＝6400 km，地球的第一宇宙速度v₁≈8 km/s)

The home computer industry has been growing rapidly in the United States for the last ten years . Computers used to be large, expensive machines that were very difficult to use . But scientists and technicians have been making them smaller and cheaper while at the same time they have been made easier to use. As a result, their popularity has been increasing as more people have been buying computers for their homes and businesses. Computers have been designed to store information and compute problems that are difficult for human beings to work out. Some have voices that speak with the operators. Stores use computers to keep records of their inventories(库存货物) and to send bills to their customers(顾客) . Offices use computers to copy letters, record business and keep in touch with other offices. People have been using computers in their homes to keep track of the money they spend.

One important new use for computers is for entertainment(娱乐). Many new games have been designed to be played on the computers. People of all ages have been playing these games, People also have been buying home computers to play computer games, watch movies and listen to concerts at home. They have become very popular indeed.

小题1: Computers used to _____.

A．work rapidly

B．be large and expensive

C．be easy to use

D．be used for fun小题2: In recent years , computers are being made ______.

A．larger and more expensive

B．smaller and cheaper

C．more difficult to use

D．to work more slowly小题3: Home computers can be used for ______.

A．writing letters

B．playing games

C．doing business

D．all of the above小题4: Salesmen use computers mainly to ______.

A．check the list of goods and materials that are kept in the store house

B．play games for pleasure

C．talk with their friends

D．write letters

腔内注射是妇科恶性肿瘤肺转移病人最好的给药途径

医师是医疗工作的主体。