反映制品机械强度的指标是()。 ["体密度","电阻率","抗压强度","真密度"]
配料炭质原料氧化的温度大约在()。 ["300℃左右","350℃左右","500℃左右","600℃左右"]
在一个网络节点中,链路加密仅在以下哪项中提供安全性?() ["A、数据链路层","B、物理层","C、通信层","D、通信链路"]
一般证书采用哪个标准?() ["A、ISO/IEC 15408","B、ISO/IEC 17799","C、BS 7799","D、X.509V3"]
在密码学中,需要被交换的原消息被称为什么?() ["A、密文","B、算法","C、密码","D、明文"]
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