Portland cement is termed a hydraulic cement because its hardness develops by chemical reaction with .
A.
Clay
B.
Lime
C.
Gypsum
D.
Water
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【单选题】Jade is the highest award in Chinese culture and medals are the most important prize in Olympics,so medals with jade is the perfect ______ to present the Olympics in Beijing.
【单选题】Jade is the highest award in Chinese culture and medals are the most important prize in Olympics, so medals with jade is the perfect _________ to present the Olympics in Beijing. [ ]