A:淀粉
B:蛋白质
C:脂肪
D:维生素
如图为生活污水处理的一种装置.以下叙述正确的是( )
—What should we do for the disabled children in the Children's Home?
—You're supposed to________ a study group to help them.
一个数除以57,余数最大的只能是56.