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单项选择题

虚函数有继承性，基类中说明的虚函数只要在它的派生类中函数原型完全一致，一定是虚函数。
A、正确
B、错误

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相关考题

单项选择题
Researchers have found that REM（rapid eye movement）sleep is important to human beings. This type of sleep generally occurs four or five times during one night of sleep lasting five minutes to forty minutes for each occurrence. The deeper a person's sleep becomes, the longer the periods of rapid eye movement.
There are physical charges in the body to show that a person has changed from NREM（non-rapid eye movement）to REM sleep. Breathing becomes faster, the heart rate increases, and, as the name implies, the eyes begin to move quickly.
Accompanying these physical changes in the body is a very important characteristic of REM sleep. It is during REM sleep that a person dreams.
According to the passage, how often does REM sleep occur in one night?（　　）
A.once
B.twice
C.fouroffivetimes
D.fortytimes
单项选择题
建筑预埋件的锚筋不应采用下列何种钢筋？（　　）
A.HPB235级
B.HRB335级
C.HRB400级
D.冷加工
判断题
在异常及事故处理时应有专人记录与事故有关的现象和各项操作的时间。
正确
错误
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