After vacuum mixing, the volumetric shrinkage can be raised from 3 5% to __________ % in different cements.

After vacuum mixing, the volumetric shrinkage can be raised from 3 5%

1.	After vacuum mixing, the volumetric shrinkage can be raised from 3 5% to __________ % in different cements.
A.	1-2
B.	3-5
C.	5-7
D.	6-8
Answer» D. 6-8