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【单选题】
治疗接触性口角炎的首要措施是
A.
补充维生素
B.
治疗全身疾病
C.
局部应用抗生素软膏
D.
去除过敏原
E.
局部应用抗病毒软膏
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A.
合作是事业成功的土壤 ,各国应相互依存、休戚与共
B.
合作可以消除国家之间的分歧与矛盾
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A.
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B.
A student.
C.
A doctor.
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A.
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B.
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C.
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D.
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【单选题】明矾是一种净水剂,明矾净水的原理是( )
A.
Al 3 + 有较强的吸附性
B.
Al 3 + 与悬浮物生成沉淀
C.
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D.
明矾难溶于水
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