问题
单项选择题
Normally，potable water systems are connected directly to the（）.
A.fire-main system
B.feed-water system
C.freshwater sanitary system
D.domestic water tank
答案
参考答案：E
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Normally，potable water systems are connected directly to the（）.
A.fire-main system
B.feed-water system
C.freshwater sanitary system
D.domestic water tank
参考答案：E