A .85%乙醇90ml+40%甲醛10ml
B .90%乙醇90ml+40%甲醛10ml
C .95%乙醇90ml+40%甲醛10ml
D .80%乙醇90ml+40%甲醛10ml
E .75%乙醇90ml+40%甲醛10ml