单项选择题
A.0.1g B.0.2g C.0.5g D.1.0g
A.25mg B.50mg C.75mg D.100mg
A.一次0.1g B.一次0.2g C.一次0.4g D.一次0.5g
A.5mg B.10mg C.15mg D.20mg
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