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【单选题】
在人体内,维生素 D 的活性形式是
A.
I-OH-D3
B.
1 , 25-(OH) 2 -D 3
C.
麦角固醇
D.
胆钙化醇
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A.
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B.
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C.
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D.
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A.
前后安装
B.
水平安装
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垂直安装
D.
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A.
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B.
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C.
It lacks an objective evaluation of the role of Internet businesses.
D.
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【单选题】刀开关必须(),合闸状态时手柄应朝上,不允许倒装或平装
A.
垂直安装
B.
左右安装
C.
水平安装
D.
前后安装
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A.
朝上
B.
朝下
C.
朝左
D.
朝右
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