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【单选题】
以下有关物流作业系统不正确的是(A.
运输系统
B.
信息系统
C.
装卸搬运系统
D.
流通加工系统
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皮皮学刷刷变学霸
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
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