My family ______ all at home now.[ ]
A. is
B. are
C. do
D. can
答案：B
朱砂安神丸与碘化钾合用，会导致赤痢大便()
制备ABC复合物时，亲和素的浓度不能高于()
A.5μg/ml
B.10μg/ml
C.20μg/ml
D.30μg/ml
E.40μg/ml
