你告诉朋友这本书是红色的,可以说
A:This book is green.
B:This book is red.
She ______ to do homework every day.
根据图中通电螺线管的N、S极,在图中标出磁感线的方向和电流方向.
A. They can make people feel happy.
B. They can make people strong and healthy.
下列有关仪器刻度位置的叙述正确的是