试题与答案

小儿佝偻病的原因通常是缺乏 A.维生素A B.维生素B1 C.维生素B2

题型:单项选择题

题目:

小儿佝偻病的原因通常是缺乏

A.维生素A
B.维生素B1
C.维生素B2
D.维生素C
E.维生素D

答案:

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参考答案:[6]1000 [7] True或任何非0数值 [8] Time或Time$解析: Interval是计时器最重要的属性,用来设置一定的时间间隔用来触发Timer事件。Interval以毫秒为单位,设为1000时表示1秒,根据题意,第6...

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