【单选题】【消耗次数:1】
木质化的细胞壁滴加( )溶液呈现红色或紫红色。
间苯三酚和浓盐酸
苏丹III
稀碘液
氯化锌碘液
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相关题目
【单选题】 木质化的细胞壁滴加( )溶液呈现红色或紫红色。
①  间苯三酚和浓盐酸
②  苏丹III
③  稀碘液
④  氯化锌碘液
【单选题】 氯化锌的浓溶液,由于生成配位酸,而具有( )。
①  碱性
②  弱酸性
③  中强酸
④  显著酸性
【判断题】 盐酸肾上腺素分子中含酚羟基,加入三氯化铁试液即生成翠绿色配合物,再加氨试液,变紫色,最后 变成紫红色。
①  正确
②  错误
【判断题】 终点颜色有蓝色变为紫红色
①  正确
②  错误
【单选题】 氯化铜的稀溶液为蓝色,浓溶液为()。
①  绿色
②  红色
③  蓝色
④  紫色
【单选题】 火烧产生紫红色烟雾的药材是
①  青黛
②  芦荟
③  松花粉
④  蒲黄
⑤  海金沙
【判断题】 豫西地区寒武系属海相沉积环境,岩石类型为灰岩,白云岩夹有紫红色砂岩,紫红色粉砂质泥岩,偶尔可见食盐假晶。在紫红色砂岩,紫红色粉砂质泥岩沉积时,气候炎热干燥。( )。(1.0分)
①  A.对
②  B.错
【单选题】 卢卡斯试剂是由(  )与无水氯化锌所配置的溶液。
①  稀盐酸
②  浓盐酸
③  稀硫酸
④  浓硫酸
【单选题】 某中药提取液只加盐酸不加镁粉,即产生红色的是
①  黄酮
②  黄酮醇
③  二氢黄酮
④  异黄酮
⑤  花色素
【判断题】 木质化是指细胞壁内增加了木质素,它是芳香族化合物’可使细胞壁的硬度 增加,细胞群的机械力增加。
①  正确
②  错误
随机题目
【单选题】 Which of the following is not grammar presentation method?
①  Deductive method
②  Inductive method
③  Guided discovery method
④  Communicative teaching method.
【单选题】 What is the realistic goal of teaching pronunciation?
①  Consistency
②  Intellegibility
③  Communicative efficiency
④  All of the above.
【单选题】 Which type does the following production practice belong to? She sells sea shells on the seashore.
①  Make up sentences
②  Using meaningful context
③  Using pictures
④  Using tongue twisters.
【单选题】 Which type does the following production practice belong to? The students repeat what the teacher says. This activity can practice individual sounds, individual words, groups of words, and sentences.
①  Listen and repeat
②  Fill in the blanks
③  Make up sentences
④  Using meaningful context
【单选题】 What does the falling intonation on the question “where do you live ?” indicate?
①  I am telling you something you do not know
②  I have not finished yet
③  I am asking a genuine question
④  I know you have told me before.
【单选题】 What is reflected as important in the following example? A. Would you please turn down the radio a little bit? B. Sorry. ↘ (no, I do not want to.) Or B. Sorry? ↗ (what did you say?)
①  Stress
②  Intonation
③  Sounds
④  Pitch Part
【单选题】 What does the falling intonation on the statement “he is moved to Glasgow.” indicate?
①  I am telling you something you do not know
②  I have not finished yet
③  I am asking a genuine question
④  I know you have told me before.
【单选题】 Which of the following is true about pronunciation teaching?
①  Learners whose native language has similar sounds are less likely to have problems with pronunciation
②  Learners who have more exposure to English need less focus on pronunciation
③  Beginning Chinese learners of English need a certain degree of focus on pronunciation
④  All of the above.
【单选题】 Which of the following do not belong to minimal pair?
①  Will well
②  Till tell
③  Fill fell
④  Well well.
【单选题】 What are the ways of practicing stress?
①  Use gestures
②  Use the voice
③  Use the blackboard
④  All of the above.