A:血浆、血清
B:血浆、血浆
C:血清、血浆
D:血浆、组织液
— Are you a fan of Zhou Libo?—Yes. Not only I but also my sister him very much.
早春播种后,用塑料薄膜覆盖地面能够促进提早出苗,覆盖地膜的主要作用是( )