SSL协议包括哪些特性？（  ）
A、服务器认证
B、客户认证
C、SSL链路上的数据完整性
D、SSL链路上的数据保密性

It was a________room,with beautiful wall paper,waxed fl...

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学前教育不能促进儿童认知的发展。 A、正确 B、错误

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A、正确
B、错误

I had hardly sat down_______he stepped in.A.whenB.thatC...

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