【单选题】【消耗次数:1】
用于根管冲洗剂的过氧化氢溶液浓度是
1%
15%
20%
30%
3%
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相关题目
【单选题】 用于根管冲洗剂的过氧化氢溶液浓度是
①  1%
②  15%
③  2%
④  30%
⑤  3%
【单选题】 过氧化氢可以电离出氢离子,因此过氧化氢是()酸。
①  一元酸
②  弱酸
③  三元酸
④  二元酸
【单选题】 过氧化氢可以与水互溶,是因为过氧化氢可以雨水形成()。
①  氢键
②  共价键
③  氧气
④  相应化合物
【单选题】 过氧化氢由于见光易分解,因此贮存在()。
①  棕色瓶
②  广口瓶
③  容量瓶
④  锥形瓶
【单选题】 过氧化氢置于阴凉处保存,同时加少许()以抑制分解。
①  还原剂
②  抑制剂
③  氧化剂
④  催化剂
【单选题】 过氧化氢异丙苯的分解反应中,所使用的催化剂为( )。
①  硫酸
②  磺酸型离子交换树脂
③  丙烯醛
④  丙腈
【单选题】 酸性条件下,KBr 被过氧化氢氧化,产物溶于四氯化碳,显( )色。
① 
②  橙红
③ 
④ 
【单选题】 1%~2%溶液用于根管冲洗和消毒的是
①  过氧化氢
②  碘仿
③  碳酸氢钠
④  次氯酸钠
⑤  氯胺-T
【判断题】 不对称烯烃与乙硼烷加成后再过氧化氢碱性水解得反马氏规则产物。
①  正确
②  错误
【单选题】 次氯酸钠溶液作为根管冲洗液,最常使用的浓度是
①  0.50%
②  25%
③  30%
④  5.25%
⑤  10%~30%
随机题目
【单选题】 Air pollution __________ , this city is still a good place to live in.
①  being greatly reduced
②  greatly being reduced
③  to greatly reduce
④  greatly to reduce
【单选题】 TOEFL is a test for students __________ native language is not English.
①  that
②  of whom
③  whose
④  which
【单选题】 __________ all our efforts to save the school, the authorities decided to close it.
①  As for
②  Besides
③  Except
④  Despite
【单选题】 That was so serious a matter that I had no choice but __________ the police.
①  called in
②  calling in
③  call in
④  to call in
【单选题】 Well done. Congratulations on your success.
①  Thank you very much
②  Oh, no, no
③  No, I didn’t do very well
④  Sorry, I couldn’t any better
【单选题】 Good morning, sir. May I help you?
①  No, I don’t buy anything
②  No, I don’t need your help
③  Yes, I need some sugar
④  Oh, no. That’s OK
【单选题】 I’d like to take you to the coffee house on the corner.
①  Thank you. You shouldn’t’ do that
②  Thanks, I’d like to go with you
③  No, you can’t say so
④  No, no, You can’t do that
【单选题】 He’s determined to finish the job __________ long it takes.
①  no matter
②  however
③  wherever
④  whatever
【单选题】 -- Could I speak to John Harris, please.
①  Oh, how are you
②  I’m John
③  I’m listening
④  Speaking
【单选题】 Why don’t you travel to New York on vacation?
①  I don’t want to go
②  Excuse me, because I can’t
③  I want to, but I haven’t got enough money
④  Because I’m going to school today