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【单选题】
对于凝胶柱色谱法,下列说法正确的是A.
凡是多孔性物质用于凝胶柱色谱作固定相
B.
凝胶柱色谱法的分离效果取决于凝胶孔径的大小和被分离组份分子的大小
C.
被分离组份分子越小,越容易通过凝胶柱,柱内保留时间越短
D.
凝胶色谱法按分离原理不同可分为凝胶渗透色谱法和凝胶过滤色谱法
E.
凝胶色谱法只适用于小分子之间的分离
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举一反三
【单选题】Hawaii, the newest state in the United States, is a 【C1】______ of eight large islands and many small 【C2】______ in the Central Pacific Ocean, about 2,200 miles west of San Francisco. Hawaii was probab...
A.
group
B.
bunch
C.
gathering
D.
sort
【单选题】The control panel uses all the newest technology and is considered state-of-the-art. 该句中的形容词有
A.
control
B.
considered
C.
state-of-the-art
【单选题】Building Confidence The two arms of Coega, South Africa's newest port, extend into the Indian Ocean gracefully. These are built from thousands of huge, oddly-shaped, 30-ton concrete blocks. They are d...
A.
Y
B.
N
C.
NG
【单选题】第五套人民币1999年版100元、50元纸币共有（）种公众防伪特征，2005年版第五套人民币100元、50元纸币共有（）种公众防伪特征。
A.
9，10
B.
9，11
C.
10，11
D.
10，10
【判断题】轨向是指钢轨头部内侧面沿钢轨方向的横向凹凸不平顺,即直线上轨道是否直, 曲线上轨道是否圆顺。直线上以 10m 弦在轨头内侧顶面下 16mm 处量取最大矢度。
A.
正确
B.
错误
【单选题】The two newest states which joined the United States are
A.
Alaska and Florida.
B.
Hawaii and Oregon.
C.
Alaska and Hawaii.
D.
California and New Mexico.
【单选题】The two newest states which joined the United States are ______.
A.
Alaska and Kentucky.
B.
Hawaii and Arizona.
C.
Alaska and Hawaii.
D.
Vermont and New Mexico.
【单选题】The two newest states which joined the United States of America are
A.
Alaska and Florida.
B.
Hawaii and Oregon.
C.
Alaska and Hawaii.
D.
California and New Mexico.
【简答题】The two newest states are _________ and ________ .
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