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【单选题】
约翰·雷对于博物学的愿景是（）。A.
将博物学归属于应用学科
B.
将博物学归属于医学学科
C.
将博物学归属于哲学学科
D.
将博物学归属于理论学科
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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【简答题】阿司匹林肠溶片含量的测定 精密称取片粉适量(约相当于阿司匹林 0.3g ),加入中性乙醇溶解后,加入酚酞 3 滴,滴加 NaOH 滴定液( 0.1mol/L )至溶液显粉红色。 ( 此时中和了存在的游离酸,阿司匹林也同时成为 Na + ) , 再精密加入 NaOH 滴定液( 0.1mol/L ) 40ml ,置水浴上加热使酯结构水解,迅速放冷至室温,再用 H 2 SO 4 滴定液( 0.05mol...
【简答题】根据句意及首字母提示，完成下列单词拼写。 1. —Sorry, I’m late. —That’s all r________. 2. —Are you a teacher, t________? —Yes, I am. 3. This is Mary. She is my good f________. 4. I can s______ the ABC song. 5. Jeff is an E...
【单选题】听力原文：M. Excuse me, but I didn't hear clearly what you said. Did you say that your teaching assistant would mark the exam papers? W: No. I said he would collect the papers. I'll grade them myself. What...
A.
Her teaching assistant would grade the exam papers.
B.
She would collect the exam papers herself.
C.
She would mark the exam papers herself.
D.
She would not give her students an exam.
【简答题】根据句意及首字母提示补全单词。 1. WeII,John. I'II leave you a QQ m_______online this evening 2. My teacher was very sad when she saw our d_______English grades. She didn't want to teach us anymore 3. My sister was s...
【简答题】精密称取阿司匹林试样0.4227g，加中性乙醇20ml溶解后，加酚酞指示剂两滴， 用0. 1008mol/L NaOH滴定液滴定至终点，消耗NaOH滴定液22. 68mI。每毫升0. 1000mol/L，?NaOH 滴定液相当于18.02mg阿司匹林。求阿司匹林的含量。
【简答题】( )22. She teaches____ English and I teac h ____ Chinese.A. I; she B. me; her C. my; her D. his; hers
【简答题】已知 f=lambda x,y:x**y, 则表达式 f(2,3) 的结果为___________.
【单选题】精密称取阿司匹林0.4005g,加中性乙醇20ml溶解后,加酚酞指示剂3滴,用NaOH滴定液滴定至粉红色且30秒不褪色停止滴定,消耗滴定液22.00ml。已知每1ml该NaOH滴定液相当于18.02mg的阿司匹林,则阿司匹林的含量为:
A.
0.03694g
B.
0.09899g
C.
0.9998g
D.
0.9899g
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