有一个多项式为a8﹣a7b+a6b2﹣a5b3+…,按照此规律写下去,这个多项式

题型:填空题

问题:

有一个多项式为a8﹣a7b+a6b2﹣a5b3+…,按照此规律写下去,这个多项式的第八项是(    )

考点:探索规律
题型:填空题

中国短道速滑选手王濛敢打敢拼,英勇顽强,成就了2010年冬奥会的“三冠王”,不仅发扬了奥林匹克“更快、更高、更强”的竞技精神,而且集中体现了优秀的中 * * 精神。这种民族精神就是 [ ]

A、团结统一

B、爱好和平

C、勤劳勇敢

D、自强不息

题型:填空题

判断正(T)误(F)。

     (T=True, F = False)

     What is color? Why do some of the things around us look red, some green, others blue?

     Colors are really made by reflected (反射) light. We can see colors because most of the things reflect light.

Something is red, for it reflects most of the red light. In the same way, if something is green, it reflects most

of the green light. If something reflects all light, it is white. If it doesn't reflect any light, it is black.

     Some light is reflected. But the other light is taken in and turns into heat. The darker the color is, the less

light is reflected, and the more light is taken in. For this reason, dark-colored clothes are warmer in the sun

than light-colored clothes.

( )1. Colors are made by reflected light.                                              

( )2. Something looks white because it reflects all kinds of light.                   

( )3. In the dark we can't see anything because all the things don't reflect any light.

( )4. When the other light is taken in, it will be reflected in the end.              

( )5. In the sun, the warmest clothes must be light-colored.                          

题型:填空题

需要两个或更多的部门响应的情况是( )。

A.一级紧急情况

B.三级紧急情况

C.一般紧急情况

D.二级紧急情况

题型:填空题

Access中最多允许嵌套的组页眉/页脚的个数为( )。

A.4

B.6

C.8

D.10

题型:填空题

小丽要研究金属圆柱体受的浮力与浸没在水中深度h的关系,实验装置如图甲所示。在弹簧测力计下挂一个金属圆柱体,测出金属圆柱体的重力,然后让圆柱体缓慢地浸入水中,从圆柱体底面接触水面开始,到完全浸没水中(未接触容器底部),记录圆柱体浸入水中不同深度h时测力计的示数,并得到测力计示数F1和圆柱体受的浮力F2随h变化的图象,图中能反映圆柱体受的浮力F2随h变化的图象是______(填①或②);从图中可以看出金属圆柱体与水的密度的关系是ρ______2ρ(填“>”“=”或“<”)。                  

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