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【简答题】
在管道系统中起()、()、()、()等作用。
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【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
【多选题】资本主义宪法产生的社会历史条件有( )
A.
经济条件
B.
政治条件
C.
法律条件
D.
思想条件
【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
【多选题】资本主义宪法产生的社会历史条件有哪些?
A.
经济条件
B.
政治条件
C.
思想条件
D.
法律条件
【单选题】急性心肌梗死胸痛与心绞痛的区别是( )
A.
性质不同
B.
范围不同
C.
部位不同
D.
持续时间不同
E.
放射部位不同
【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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