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【判断题】
逻辑运算符用于对布尔型的数据进行操作，其结果仍是一个布尔型A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】Internal scale economies occur when:
A.
expansion of output by a firm leads to greater specialization of labor.
B.
expansion in an industry drives down the input prices.
C.
industry growth leads to a greater diffusion of knowledge among firms.
D.
a firm pays higher input prices to expand production.
【单选题】B类网络的缺省子网掩码为( ). (3分)
A.
255.255.255.255
B.
255.255.255.0
C.
255.255.0.0
D.
255.0.0.0
【单选题】When is the internal temperature of a large desert mammal lowest?
A.
Just before sunrise.
B.
In the middle of the day.
C.
Just after sunset.
D.
Just after drinking.
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