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【单选题】
典型的大肠埃希菌的生化反应结果是A.
乳糖(+), lMViC(+、+、-、-)
B.
乳糖(-),lMViC(+、+、-、-)
C.
乳糖(+), lMViC(-、-、+、+)
D.
乳糖(-),lMViC(-、-、+、+)
E.
可发酵任何糖类,lMViC(+、-、+、-)
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【简答题】实验室常用苯甲醛在浓氢氧化钠溶液中制备苯甲醇和苯甲酸，反应式如下： 已知： ①苯甲酸在水中的溶解度为：0.18g（4℃）、0.34g（25℃）、0.95g（60℃）、6.8g（95℃） ②乙醚沸点34.6℃，相对密度0.7138，易燃烧，当空气中含量为1.83～48.0%时易发生爆炸． 实验步骤如下： ①向图1所示装置中加入8g氢氧化钠和30mL水，搅拌溶解．稍冷，加入10mL新蒸过的苯甲醛．开启...
【简答题】Kevin: Hey, Jenny. What's up? Jenny: Not much. Have you seen the new Peachbook (1) ________ computers? They look awesome. Kevin: Yeah, I saw them last night. Which one do you want? Jenny: I want ...
【简答题】根据句意及首字母提示在横线处填上恰当的单词 1. I saw a very e__________ movie last night. 2. My mother said she did the t__________ housework, and she was t__________ of it. 3. The sights of 13cijing arc very f__________, ...
【单选题】Last night 1 saw Tom lying in bed, ____in deep thought.
A.
lost
B.
losing
C.
to lose
D.
being lost
【简答题】Kevin: Hey, Jenny. What's up? Jenny: Not much. Have you seen the new Peachbook (1) computers? They look awesome. Kevin: Yeah, I saw them last night. Which one do you want? Jenny: I want to get the...
【简答题】Exercise C: Listen and complete the conversation. Kevin: Hey, Jenny. What’s up? Jenny: Not much. Have you seen the new Peachbook (1) _________ computers? They look awesome. Kevin: Yeah, I saw them ...
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