选择题：11. 细胞生活的内环境是指( )(本题3.0分)A、 体液B、 细胞内液C、 细胞外液D、 血液

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验证消息完整性的方法是 （ ）(A)大嘴青蛙认证协议(B)数字签名(C)基于公钥的认证(D)消息摘要