A:0℃
B:﹣15℃
C:低于0℃,高于﹣15℃
D:条件不足,无法判断
I brush my teeth and wash my face. ____
I go to school.____
What do you do after breakfast? ____
I go to school on foot. ____
What do you do before breakfast? ____
How do you go to school? ____
Look! All people _______ fun at the beach.
压敏电阻的阻值会随所受压力的增大而减小,一同学利用压敏电阻设计了判断升降机运动状态的装置,如图甲所示,将压敏电阻平放在升降机内,受压面朝上,在上面放一物体m,升降机静止时电流表示数为I0。某过程中电流表的示数如图乙所示,则在此过程中 ()