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【简答题】
某兴趣小组同学在复习二氧化碳的化学性质时，做了下图所示的实验，根据图示回答下列问题。 (1)装置B中石蕊试液的作用是________________，装置D中反应的化学方程式是_________________。 (2)实验结束后，同学们把容器内所有物质倒入同一个废液缸中，发现废液浑浊并呈蓝色，说明废液中一定没有(写化学式，下同)________。 (3)为了科学处理实验后产生的废液，同学们先将废液过滤，再向得到的滤液中逐滴加入稀盐酸，看到开始明显现象，过一会儿有气泡产生，溶液由蓝色变为紫色，则滤液中的溶质除指示剂外还一定含有___________，一定没有________。
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【单选题】S-HTTP(安全超文本传输协议),是 的协议,会对HTTP扩充安全特性、增加报文的安全性。
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【单选题】S-HTTP(安全超文本传输协议),是 的协议,会对HTTP扩充安全特性、增加报文的安全性。
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