Whatcanbeextr actedfromfine-powderflyash?
A.Aluminum,silicon,andmagnetic.
B.Additive.
C.Pavingmaterial.
D.Cement.
正确答案:A答案为A。根据第二段第一句,Inadditiontousingflyashasaconcreteadditive,thetechnologyisavailabletoextr actthemainmineralcomponents-aluminum,silicon,andmagnetic作出该项选择。



