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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
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题目标签:氟化钙氟化镁
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参考解析:
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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

【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