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【单选题】
“1.2.3”溶液的正确的配方是A.
50％硫酸镁50ml，甘油60m1，温开水70ml
B.
50％硫酸镁40m1，甘油50ml，温开水60ml
C.
50％硫酸镁60ml，甘油70ml，温开水80ml
D.
50％硫酸镁30ml，甘油60ml，温开水90ml
E.
50％硫酸镁30ml，甘油50ml，温开水70ml
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