比例尺的表达方式有数字式、____和____.
一次函数y=﹣2x+ 52 的图象与y轴的交点坐标是____.
(____) It's a programme about China.
(____) We've got lots of food.
(____) Thank you for talking to us.
(____) She couldn't read or write.
(____) He didn't have any legs then.
下列操作中只发生物理变化的是( )