单项选择题

自然数集上的小于关系的逆关系为（）

A．大于等于关系
B．大于关系
C．不等于关系
D．无法确定

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单项选择题

Why did the killer choose to kill Ole Andreson in Henry's lunchroom? A.
Because the killers were hungry. B.
Because this lunchroom was near to Ole Andreson's home. C.
Beacuse Ole Andreson usually came to this lunchroom to have dinner. D.
Because they had no where to go.

单项选择题

通常全局DB比背景DB简洁，更适合用于上位机监控。
A、正确
B、错误