A.Where to have the meeting. B.When to have the meeting. C.Who to have the meeting. D.What to discuss at the meeting.
A. 对 B. 错
A. 毛发+指甲 B. 指甲+汗腺 C. 皮脂腺+汗腺 D. 毛发+汗腺+皮脂腺+指（趾）甲
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