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当前学科:1K415020城市供热管道工程施工
题目:
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一次热网与二次热网采用换热器连接,一次热网热媒损失很小,但中间设备多,实际使用较广泛。这是()。
A . A、开式系统
B . B、闭式系统
C . C、供水系统
D . D、回水系统
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