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血培养皮肤消毒的“三步法”是指()

A.75%乙醇30s,10%碘伏60s,75%乙醇60s
B.10%碘伏60s,75%乙醇30s,75%乙醇30s
C.75%乙醇30s,75%乙醇30s,10%碘伏60s
D.异丙醇30s,75%乙醇60s,75%乙醇30s

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