用所学单词自编两个句子。
例如:I can draw, I can draw, I can draw a flower.
I can read, I can read, I can read a book.
I can sing, I can sing, I can sing a song.
如果水位升高3m时水位变化记作+3m,那么水位下降5m时水位变化记作( )
如图所示,质量为6kg的物体置于水平地面上,受到一个与水平面方向成37°角的拉力F=20N作用,恰好做匀速直线运动,求物体与水平面间的动摩擦因数.g=10m/s2(sin37°= 35 ,cos37°= 45 )
(B)
Hi, friends! What do you like to do after school? In my school, we have different things (不同的事情) to do.
Mike does his homework (家庭作业) in the classroom. He likes doing his homework at school. The classroom building is in the middle of the school.
Lucy likes playing on the playground. Many students play there after school. The playground is behind the classroom building.
Jack likes reading books in the library after school. There are lots of books in our library. The library is on the left of the classroom building.
Students can play computer games in the science building. Peter likes playing computer games after school. The science building is on the right of the classroom building.
下列判断正确的是( )