For air conditioning the operation theater in a hospital, the percentage of outside air in the air supplied is

For air conditioning the operation theater in a hospital, the percent

1.	For air conditioning the operation theater in a hospital, the percentage of outside air in the air supplied is
A.	Zero
B.	20
C.	50
D.	100
Answer» E.

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For air conditioning the operation theater in a hospital, the percentage of outside air in the air supplied is

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