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【单选题】
过氧化氢（H 2 O 2 ）是一种无色液体，常用作氧化剂、漂白剂和消毒剂．为了贮存、运输和使用的方便，工业上将过氧化氢转化为固态的过碳酸钠晶体（2Na 2 CO 3 ?3H 2 O 2 ），该晶体具有碳酸钠和过氧化氢的双重性质．下列物质不会使过碳酸钠失效的是（ ）A.
二氧化锰
B.
澄清石灰水
C.
盐酸
D.
氯化钠
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【简答题】生物氧化分为几种类型?比较各种类型的不同特点
【简答题】Read the passage again, and then fill in each blank with the proper words in the text to complete the following passage. Colors are often different obiects, feelings and holidays. For example, red is ...
【单选题】The consonant /v/ would bepronounced as ( ) in JapaneseEnglish.
A.
/v/
B.
/b/
C.
/f/
D.
None of the above
【简答题】语法填空 A boy quarreled with his parents and ran away from home.He had a hard life 1 any contact with his family for years.Later he wanted to go home 2 he was afraid that his parents might not welcome hi...
【简答题】Consonant sounds can be either v ________or v__,while all vowel sounds are v________.
【简答题】Consonant sounds can be either v ____ or voiceless, while all vowel sounds are v________.
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