下列不属于电源的是（ ）
A：干电池
B：蓄电池
C：发电机
D：电吹风
人的运动是由各种动作组成的,请回答相关问题:(1)人的动作，是由于____受到 ____ 传来的刺激而收缩时，牵引骨绕着____活动而产生的。(2)动作的完成，主要依靠神经系统的调节作用，其调节的基本方式是____。
No. 1 Middle School
Don't run in the hallways
Don't bring food into the classroom.
Don't listen to music in class.
You have to wear a uniform.
No. 2 Middle School
Don't bring food into the classroom
Don't wear a hat in class.
Don't go into the classroom without the teacher.
No. 3 Middle School
Don't listen to music in the classroom.
Don't run in the hallways.
You have to wear sports shoes for gym class.
在研究凸透镜成像的实验中，蜡烛由远处向凸透镜焦点靠近的过程中，小丽观察并记录了像在光屏上的变化情况，其中错误的是( )
0.48×8.5－2.5=____
