Materials can be separated into four general classes on the basis of their permeance. One class, vapor semi-permeable, means ____.
A. 0.1 perm or less
B. greater than 0.1 perm and less than 1.0 perm
C. greater than 1.0 perm and less than 10.0 perms
D. greater than 10.0 perm
Answer: C
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