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【单选题】
添加氟化钙或氟化镁时,可以()。
A.
加到阳极附近
B.
集中大量添加
C.
加到电解槽中间部位
D.
加到大面炉邦空处
题目标签:
氟化钙
氟化镁
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【判断题】氢氟酸洗废液一般采用氟化钙沉淀法处理
A.
正确
B.
错误
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【单选题】A subject which seems to have been insufficiently studied by doctors and psychologists is the influence of geography and climate on the psychological and physical health of mankind. Them seems no doub...
A.
substances which act positively or negatively on man’’s health
B.
harmful substances in the water supply
C.
substances which help provide breeding places for pests
D.
substances contributory to good health
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【简答题】氟化钙的Ksp=2.7×10-11,试求CaF2的溶解度。
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【判断题】氟化钙微溶于稀无机酸,几乎不溶于水。()
A.
正确
B.
错误
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【单选题】粉剂由二氧化硅、三氧化二铝和氟化钙组成的粘固粉是______
A.
氧化锌丁香油粘固粉
B.
聚羧酸锌粘固粉
C.
玻璃离子粘固粉
D.
磷酸锌粘固粉
E.
复合树脂
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【判断题】氟化钙可以用作玻璃的乳浊剂。
A.
正确
B.
错误
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【填空题】焊剂按其氟化钙含量的多少可分为低氟焊剂、中氟焊剂和()。
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【简答题】氟化镁能()铝在冰晶石—氧化铝溶液中的溶解损失量。
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【单选题】A subject which seems to have been insufficiently studied by doctors and psychologists is the influence of geography and climate on the psychological and physical health of mankind. Them seems no doub...
A.
focus on some unknown aspects
B.
be pursued on a larger scale
C.
go much deeper
D.
be carried out within a larger scope
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【单选题】含有稀土元素的萤石,经日光照射后可持续发光数十小时,民间称之为“夜明珠”。萤石的主要成分氟化钙(CaF2)中氟元素的化合价为
A.
+1
B.
+2
C.
-1
D.
-2
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