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【单选题】
有自来水的低氟区防龋的是
A.
含氟牙膏
B.
氟饮水
C.
氟盐
D.
氟片
E.
氟滴剂
题目标签：
自来水
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【单选题】若自来水中的含有Fe3+、Al3+，应（ ）。
A.
加入氢氧化钠掩蔽
B.
加入三乙醇胺掩蔽
C.
加入亚硫酸钠掩蔽
D.
加入氰化钾掩蔽
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【简答题】阅读理解。 Traveling is one of the most important activities and people have been interested in it for many years. Modern traffic develops fast, so traveling to different places has become much easier than...
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【单选题】自来水的pH为（）。
A.
6.0～8.5
B.
6.5～8.5
C.
6.0～8.0
D.
6.5～8.0
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【简答题】为什么自来水有氯味？
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【简答题】为什么自来水有时会发浑？
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【单选题】“水不是文化，自来水才是文化”，指的是文化的( )
A.
创造性
B.
习得性
C.
共享性
D.
累积性
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【简答题】 greener choices, from the food you eat to the way you travel, can improve your health．A recent article advises people should try low–carbon (低碳) lifestyles which could be the most important con...
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【单选题】有自来水的低氟区防龋的是
A.
含氟牙膏
B.
氟饮水
C.
氟盐
D.
氟片
E.
氟滴剂
查看完整题目与答案
