北京奥组委和国际奥委会在新闻发布上说:“中国有8亿4千万(840 000 000

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问题:

北京奥组委和国际奥委会在新闻发布上说:“中国有8亿4千万(840 000 000)人观看了奥运会开幕式,这确实是一个令人惊讶的数字.”840 000 000这个数字用科学记数法可表示为(  )

A.0.84×109

B.8.4×109

C.84×107

D.8.4×108

考点:科学记数法和有效数字
题型:选择题

下面哪个式子可以用来验证小明的计算3-(-1)=4是否正确?(  )

A.4-(-1)

B.4+(-1)

C.4×(-1)

D.4÷(-1)

题型:选择题
请仔细阅读下面题中的每人的情况说明,然后从A到E的五个项目中,根据每个人的兴趣为他们选择周末的去处。
Have fun on K. K. Island
A                               Blue Bridge
Blue Bridge is full of different places for city fun--- theaters, restaurants, museums, shopping centers. Also, don` t miss its famous night markets.
 
B                                East Hills
Summer is the best season to see the trees and flowers. Spend a quite day in the teahouses here to get away from your busy life.
 
C                                New Lake
August is Music Month in the small town. Come and enjoy different groups playing music you` ve never heard before!
 
D                                 Green Garden
Come and ride a bicycle under the sun and enjoy a country lunch with farm-fresh fruits and vegetables.
 
E                                East Coast Park
Looking for a one-stop family fun site? It has to be East Coast Park. It `s a perfect place to enjoy surfing and fishing or just lying in the sun.
小题1:The Brown want to spend their weekend near the sea. They want to find a place where their two sons can play with the sand and Mr. Brown can go swimming with his wife.
小题2: Diana is a singer. She is going to join her friend’s band in the summer music festival.
小题3:Stilwell loves country life. He wants to spend the weekend with his girlfriend in a place where they can go bike riding and enjoy fresh vegetables.
小题4:Alice has well-paid but stressful job. She would like to spend her Sunday in a quiet place. She also wants to climb hills with her best friend or just drink a cup of tea and talks about something they are both interested in.
小题5:Charles loves city life. He is looking for a place to eat and have fun with his friends on Saturday night.
题型:选择题

下列眼部超声检查法中,哪种方法最简便实用

A.经眼睑法

B.水囊法

C.探头块法

D.经水法

E.软探头法

题型:选择题

图(一)表示呼吸过程中______时的状态,此时,膈肌______,胸廓______.肺内气压______外界气压压,于是气体被______.相反则是气体被______.

题型:选择题

明清江南私家园林理水的基本原则和手法。

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