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【单选题】
维生素D在血液中的主要形式是A.
维生素D３
B.
维生素D2
C.
25-(OH)D3
D.
1,25-(OH)2D３
E.
24,25-(OH)2D３
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A.
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C.
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A.
can use smile to reduce the nervousness
B.
cannot focus on their presentation
C.
cannot demonstrate any facial expressions
D.
can check for appropriate facial expressions with the help of mirror
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