下列哪一项蒸汽供暖系统中疏水器作用的说法是正确的?( )
考试:=$ecms_gr[fenlei]?>
科目:=$ecms_gr[kemu]?>(在线考试)
问题:
A:排出用热设备及管道中的凝结水,阻止蒸汽和空气通过
B:排出用热设备及管道中的蒸汽和空气,阻止凝结水通过
C:排出用热设备及管道中的空气,阻止蒸汽和凝结水通过
D:排出用热设备及管道中的凝结水和空气,阻止蒸汽通过
答案:
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