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举一反三
【单选题】混凝土配合比设计中的三个基本参数分别是（）。
A.
水灰比、砂率、单位用水量
B.
水灰比、水化热、单位用水量
C.
水化热、砂率、单位用水量
D.
水灰比、砂率、水化热
【单选题】Many Americans harbor a grossly distorted and exaggerated view of most of the risks surrounding food．Fergus Clydesdale, head of the department of food science and nutrition at the University of Massac...
A.
They overlook the risks of the food they eat.
B.
They overestimate the hazards of their food.
C.
They are overoptimistic about the safety of their food.
D.
They overstate the government's interference with the food industry.
【单选题】混凝土实验室配合比为 1 : 2.5 : 5 ,水灰比为 0.6 ,砂、石含水率为 4% 和 2% ,水泥用量为 300kg/m 3 混凝土,施工配合比的用水量为( )。
A.
180kg
B.
120kg
C.
240kg
D.
90kg