A.A点处设防火阀,B点处设防火阀 B.A点处设防火阀,B点处不设防火阀 C

题库2022-08-02  19

问题 A.A点处设防火阀,B点处设防火阀B.A点处设防火阀,B点处不设防火阀C.A点处不设防火阀,B点处设防火阀D.A点处不设防火阀,B点处不设防火阀

选项 A.A点处设防火阀,B点处设防火阀
B.A点处设防火阀,B点处不设防火阀
C.A点处不设防火阀,B点处设防火阀
D.A点处不设防火阀,B点处不设防火阀

答案 A

解析
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