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问题 判断题

防火墙的基本工作原理是对流经它的IP数据报进行扫描，检查其IP地址和端口号，确保进入子网和流出子网的信息的合法性。

答案

参考答案：对

单项选择题

汉译英：“承兑交单；付款交单；货到即付”，正确的翻译为：( )

A. document against acceptance; document against payment; payment against arrival
B. document against payment; document against acceptance; payment against arrival
C. document against acceptance; payment against arrival; document against payment
D. payment against arrival; document against payment; document against acceptance
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单项选择题

有以下程序：
main()
int a，b，d=25；
a=d/10%9；b=a＆＆(-1)；
printf("%d，%d\n"，a，b)；

程序运行后的输出结果是______。

A．6，1

B．2，1

C．6，0

D．2，0
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