下列关于磁现象的说法正确的是( )
A:将小磁针放在地球周围某一空间,若它静止时偏离南北方向,说明该空间存在除地磁场以外的其他磁场
B:在研究磁场强弱分布时,放不放铁屑磁感线都存在
C:在磁场中某点放一小磁针,小磁针静止时,其S极的指向为该点磁场方向
D:地磁的N极在地理的北极附近
2.78÷1.2,商是2.3时,余数是( )
(1)在下列横线上用含有a,b的代数式表示相应图形的面积.
①____ ; ②____ ; ③____ ; ④____ .
(2)通过拼图,你发现前三个图形的面积与第四个图形面积之间有什么关系?请用数学式子表示:____ ;
(3)利用(2)的结论计算992+2×99×1+1的值____ .
Minions(小黄人) are some small robots in a movie. They are yellow, and they always wear blue trousers. Some have one eye and some have two eyes. Their arms and legs are short, so they look very funny. Bananas are their f 6 food. Minions are small, but they are very smart. ⑵Minions work hard and they have different jobs. Some work as policemen. Some work as tennis players and some work as teachers. Many people like these cute yellow robots. Let's meet three of them.
Dave has two eyes.He is tall and he is a little thin.His hair is short and straight.He likes working,he doesn't like sleeping.
Stuart has one eye.He is of medium height.His hair is also short and straight.He likes playing.
Jorge has two eyes.His hair is short and always stands up.He isn't very tall-just 96 cm. ⑶他有点儿胖,因为他不喜欢做运动。
请按要求完成下列各题
我国民族的分布特点是____。