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【单选题】
盖板式和( )。A.
流动式
B.
翻转式;
C.
摇臂式;
D.
立式;
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举一反三
【单选题】The reaction of Portland cement with water is ( ).
A.
exothermic
B.
endothermic
C.
thermic
D.
dothermic
【单选题】( )is produced by mixing a small amount of an air-en-training agent with ordinary Portland cement.
A.
Low heat cement
B.
Portland pozzolana
C.
Air-en-training cement
D.
High strength cement
【单选题】____________ I arrived in South Africa , I was struck by the very great difference in the atmosphere of the country.
A.
From the moment
B.
By that time
C.
Since the moment
D.
During the time
【单选题】Portland cement is termed a hydraulic cement because its hardness develops by chemical reaction with .
A.
Clay
B.
Lime
C.
Gypsum
D.
Water
【简答题】portland cement
【简答题】7 Portland cement
【简答题】The mass percent of tricalcium silicate ( ) is 50% in Portland cement, which acts as the binding agent in concrete. Calculate the mass percent of calcium in this Portland cement.
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