托盘天平上有标尺和游码,移动游码的作用是( )
A:相当于调节横梁的平衡螺母
B:代替指针指示的刻度位置
C:相当于在左盘中增减砝码
D:相当于在右盘中增减砝码
What colour is the nose?
Lucy often goes to school __________ breakfast. It's bad for her health.