—So it is. It's made _______ grapes, and they can be made _______ many other foods.
A:from; into
B:of; by
C:by; of
D:in; from
一架天平的游码指在2.5g处,小明同学忘记将游码拨回横梁标尺的零刻度线处就调好平衡了,称量时,物体放在左盘,然后在右盘放了50g砝码后,天平刚好在水平方向平衡,则物体的质量是( )