—Open your books and turn to Page 40, boys and girls.
— ? What did you say?
A:Really
B:Why
C:How
D:Pardon
—It's in the .
①非学无以广才____
②年与时驰____
③缀行甚远____
④两狼之并驱如故____
⑤盖以诱敌____
如图为一个观览车示意图,该观览车圆半径为4.8m,圆上最低点与地面距离为0.8m,图中OA与地面垂直,以OA为始边,逆时针转动θ(θ>0)角到OB,设B点与地面距离为h,则h与θ的关系式为( )
如图所示,根据小磁针静止时的指向,标出磁体的N、S极和A点的磁场方向(用箭头表示).