单项选择题

下列关于灰砂砖描述不正确的是( ) A.
A.可长期在水流冲刷环境中使用 B.
B.可抵抗15次以上的冻融循环 C.
C.耐水性良好 D.
D.有酸性介质侵蚀的建筑部位不得使用

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组合逻辑电路设计中,先将逻辑事件的因果关系用变量来表示,输出变量的取值由逻辑关系的条件决定。( )
正确
错误

答案：正确

单项选择题

Which of the following statements is NOT mentioned in the passage?

A．Exposure to high-pitched noise results in more errors than exposure to low-pitched noise.
B．Noise affects a subject’s capacity to repeat numbers while s/he is carrying out another task.
C．Subjects exposed to noise find it difficult at first to concentrate on problem-solving tasks.
D．Subjects find it difficult to perform three tasks at the same time when exposed to noise.