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【单选题】
添加剂降低冰晶石熔体熔度最显著的是（）
A.
MgF2
B.
AlF3
C.
CaF2
D.
LiF
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【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】快速区分红色尖晶石与红色石榴石的方法是__________。
A.
在紫外灯下观察荧光效应
B.
在偏光镜下观察消光现象
C.
利用折射仪测定折射率
D.
显微镜下观察包裹体特征
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【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】快速区分红色尖晶石与红色石榴石的方法是__________。
A.
在紫外灯下观察荧光效应
B.
在偏光镜下观察消光现象
C.
利用折射仪测定折射率
D.
显微镜下观察包裹体特征
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