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问题 单项选择题

牛奶中含量较多的维生素是

A．维生素B6
B．维生素B2
C．维生素C
D．维生素A
E．维生素D

答案

参考答案：D

解析：牛奶中含维生素A较多，而维生素B1和维生素C很少。

选择题
It is said that a new robot ______ by him in a few days.

A. designed
B. has been designed
C. will be designed
D. will have been designed
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单项选择题

烧结普通砖进行尺寸偏差检验时，抽样数量为( )。

A．20块

B．25块

C．30块

D．50块
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