________ name is Danny.[ ]
A. Her
B. It's
C. He's
D. His
答案:D
给药后,尿液会变色的药物为()
A.维生素B2
B.维生素B6
C.维生素D
D.维生素B1
E.烟酰胺
农产品期货市场的作用表现在哪些方面?