Multiple Choice
Through which of the following routes can radon enter houses?
1) Crawl spaces under living areas
2) Floor drains and sump pumps
3) Porous cement block foundations
A) 1 and 2 only
B) 1 and 3 only
C) 2 and 3 only
D) 1,2,and 3
Correct Answer:
Verified
Correct Answer:
Verified
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