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【单选题】
下列实验不能获得成功的是（ ） 实验目的 实验步骤A.
探究催化剂对化学反应速率的影响 向H 2 O 2 溶液中滴加少量FeCl 3 溶液
B.
探究乙醇能发生氧化反应 将铜丝在酒精灯加热后，立即伸入无水乙醇中
C.
探究石蜡油分解的产物不都是烷烃 将石蜡油加强热产生的气体通入溴的四氯化碳溶液中
D.
探究蔗糖水解的产物中是否含有葡萄糖 取少量蔗糖溶液加稀硫酸，水浴加热几分钟后，再加入新制的氢氧化铜悬浊液并且加热
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】装配时对某两个面使用对齐约束或匹配约束的区别是( )
A.
对齐使两个面指向一致，匹配使两个面指向相反
B.
匹配可设置偏矩，而对齐不能
C.
对齐可设置定向而匹配不能
D.
以上都是对的
【单选题】There's a saying, “Life is 10% ________ happens to us and 90% ________ we choose to react to it.”
A.
who; why
B.
that; that
C.
which; when
D.
what; how
【简答题】Depression (抑郁症) is a serious problem today.Depression causes workers to be unproductive，causing companies and countries to lose billions of dollars.One expert says that depression is like cancer beca...
【单选题】Depression isn't just feeling down. It's a real illness with real causes. Depression can be set off by stressful life events, like divorce or a death in the family or it can appear suddenly, for no ap...
A.
a mental state that can be overcome without medicine
B.
an illness that no medicine can cure
C.
an experience everyone has in his life time
D.
something you can avoid by leading a happy life
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