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【单选题】
下面对电路级网关描述正确的是：()。
A.
它允许内部网络用户不受任何限制地访问外部网络，但外部网络用户在访问内部网络时会受到严格的控制。
B.
它在客户机和服务器之间不解释应用协议，仅依赖于TCP连接，而不进行任何附加包的过滤或处理。
C.
大多数电路级代理服务器是公共代理服务器，每个协议它实现。
D.
对各种协议的支持不用做任何调整直接实现。
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【简答题】工程技术上使用的热电偶分度表和根据分度表刻划的测温显示仪表的刻度都是根据冷端温度为()℃而制作的。
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