单项选择题

【A1型题】中性缓冲甲醛固定液配方是()

A.40%甲醛10ml,蒸馏水90ml
B.10%甲醛10ml,0.01mol/LpH7.4的PBS90ml
C.40%甲醛10ml,0.01mol/LpH7.4的PBS90ml
D.10%甲醛10ml,蒸馏水90ml
E.4%甲醛10ml,0.01mol/LpH7.4的PBS90ml

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