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【单选题】
下述物质中，常作为化学添加剂用于增加吸收浆液缓冲性能，提高石灰石湿法脱硫效率的是（）。
A.
火碱
B.
硝酸
C.
盐酸
D.
二元酸
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【单选题】铜山县境内有丰富的石灰石资源，石灰石是常用的建筑材料，也是生产石灰、水泥、玻璃和炼铁的原料．你认为石灰石属于（ ）
A.
纯净物
B.
混合物
C.
化合物
D.
有机物
【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.
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【单选题】铜山县境内有丰富的石灰石资源，石灰石是常用的建筑材料，也是生产石灰、水泥、玻璃和炼铁的原料．你认为石灰石属于（ ）
A.
纯净物
B.
混合物
C.
化合物
D.
有机物
【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.
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