—Excuse me. Is this _______ bike, Alice?
—No, it's not _______.
A：yours; mine
B：your; mine
C：your; my
D：yours; my
I'm very busy. I have mountains of work to do.
下列关于热机和环境保护的说法中正确的是（ ）
如图所示的台秤原理图，电源电压恒定，能满足“物体质量增大时，电压表或电流表示数也增大”要求的是（ ）
____
