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【单选题】
网络中常见的攻击种类随着网络技术的普及，网络攻击行为出现得越来越频繁。各种网络病毒的泛滥，也加剧了网络被攻击的危险。防止内部网络受到外部攻击的主要措施是( )。A.
杀毒软件
B.
加密
C.
防火墙
D.
备份
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【单选题】Everything else held constant, the interest rate on municipal bonds rises relative to the interest rate on Treasury securities when
A.
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B.
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C.
municipal bonds become more widely traded.
D.
corporate bonds become riskier.
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A.
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B.
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C.
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D.
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E.
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