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【单选题】
对溶解度很小又不易形成胶体的沉淀，选择洗涤剂的原则是（）。A.
选用沉淀剂的稀溶液洗涤，但沉淀剂在烘干或灼烧时除去
B.
用蒸馏水洗涤
C.
选用易分解、挥发的稀、热强电解质溶液洗涤
D.
哪一种洗涤剂都可
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A.
use synonyms
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A.
evidence
B.
way
C.
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D.
drug
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A.
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B.
错误
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A.
providing shocking numbers
B.
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【简答题】Complete the following sentences with proper phrases listed below. Make changes where necessary. To be a powerful and convincing speaker, you need to make sure that the tone of your voice and body la...
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A.
safety
B.
social
C.
esteem
D.
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