单项选择题
A.原油 B.热媒 C.热水 D.烟气
A.4%—6% B.6%—8% C.8%—10% D.10%—12%
A.1/3 B.2/3 C.1/4 D.1/2
A.500 B.1000 C.1500 D.2000
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