判断题

均值电压表显示的是被测电压的平均值。
正确
错误

答案：错误

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多项选择题

关于关系类说法错误的是（）
A、关系类是两个不同要素类或对象类之间的关联关系
B、关系类只能存储两个类之间的关系
C、关系类通过主键和外键创建创建
D、复合关系不可以是一对一
E、关联标注包括向前和向后两种

单项选择题

Which of the following statements about primary cell is wrong?

A． In principle, any spontaneous redox reaction can be designed as a primary cell.
B． A primary cell can be constructed with Cu and Cu2+ without other redox substances.
C． Change the pH value of the solution, the electromotive force of the primary cell will change.
D． The temperature rises, the electromotive force of the primary cell increases.