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【单选题】

分:分贝:分离

A.
暖:暖心:暖阳
B.
寒:寒冷:寒酸
C.
真:真实:真相
D.
勤:勤奋:勤劳
题目标签:分离分贝
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参考答案:
参考解析:
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【单选题】分离α一细辛醚和β一细辛醚用

A.
AGNO3硅胶柱色谱
B.
60%一65%H3PO4
C.
古拉尔试剂
D.
氧化铝柱色谱
E.
硅胶柱色谱

【单选题】蒸馏不能分离以下哪种混合物:( )

A.
高沸点甲苯(b.p. 110.4 ℃ 和低沸点乙醚(b.p. 34.5 ℃)的混合液
B.
溶解有固体化合物的乙醇溶液
C.
乙醇(95%)与5%水的混合液

【单选题】Noise Pollution Psychologists now believe that noise has a considerable effect on people’s attitudes and behavior. Experiments have proved that in noisy situations (even temporary ones), people would ...

A.
can not complete his work in a noisy situation
B.
will suffer from complete deafness because of noise pollution
C.
can be psychologically affected by working in very noisy factories
D.
may cooperate well in a noisy surrounding