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用二进制加法器对二—十进制编码的十进制数求和,当和的本位十进制数二—十进制编码小于等于1001且向高位无进位时, 44 ;当和小于等于1001且向高位有进位时, 45 ;当和大于1001时, 46 。 The Internet is an open system,and most information is available to everyone. It is very important to add to existing system for protecting the secret information.

A.Web pages
B.modem
C.security
D.network
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