The proportion of lime, silica, alumina and iron oxide in a good Portl – McqOptions

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1.	The proportion of lime, silica, alumina and iron oxide in a good Portland cement should be
A.	63 : 22 : 6 : 3
B.	62 : 22 : 3 : 6
C.	22 : 63 : 6 : 3
D.	22 : 63 : 3 : 6
Answer» B. 62 : 22 : 3 : 6

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