若a8是假分数,a10是真分数,则a一定是9.______.(判断对错)

题型:解答题

问题:

a
8
是假分数,
a
10
是真分数,则a一定是9.______.(判断对错)
考点:分数的认识及意义
题型:解答题

American boys and girls like watching TV. Some children spend six hours a day at school and four to six hours a day in front of the TV sets. Some children even watch TV for eight hours or more on Saturday.

Television(电视)is like books and films . A child can learn good things and bad things from it. Some TV programs help children to understand the news, the people and places from other countries. With TV, children do not have to go out to see films, they can hear interesting music or watch a game at home. But some programs are bad for children, so parents sometimes help them to find other interesting and useful things to do.

小题1:In America, some children spend eight hours or more _____ on Saturday .

A.studying

B.playing games

C.watching TV

D.helping their parents小题2: With TV, children can ________ at home.

A.play football

B.hold a sports meeting

C.see some films

D.have a swim小题3: What does the underlined word “programs” mean?

A.频道   

B.节目   

C.新闻   

D.小品

题型:解答题

常用的预测方法主要有两大类:⑴()预测法;⑵()预测法。

题型:解答题

以下哪项不是21-三体综合征的核型()

A.45.XO

B.46,XX(XY)/47,+21

C.46,XX(XY),-21,+t(21q21q)

D.46,XX(XY),-14,+t(14q21q)

E.47,XX(XY),+21

题型:解答题

我国曾经发射了一颗“北斗一号”导航定位卫星,预示着我国通讯技术的不断提高。该卫星处于地球的同步轨道,其质量为m,假设其离地高度为h,地球半径为R,地面附近重力加速度为g,则有(     )

A.该卫星运行周期为24h

B.该卫星向心加速度是

C.该卫星运动动能是

D.该卫星周期与近地卫星周期之比是

题型:解答题

公安政策具有( )。

A.强制作用

B.调整作用

C.指导作用

D.规范作用

更多题库