对带有混合水泵的直接连接热水供暖系统，若网路的设计供回水温度130/70℃，供暖用户的设计供回水温度 95/70 ℃，承担供暖设计热负荷的网路流量为100t/h ，则从二级网路抽引的回水量为( )。
A.42t/h
B.58t/h
C.140t/h
D.240t/h
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正确答案： C 答案分析：无
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