Although he was will, his father came back.[ ]
A. but
B. and
C. so
D. /
答案:D
方铅矿粉又名硫化铅,化学分子式为PbS。
以下可称为固相化的是:()
A.抗原吸附在胶乳上
B.抗原吸附在塑珠上
C.抗原吸附在细胞上
D.抗体吸附在微孔表面