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【单选题】
下列有关薄层色谱法概念不正确的是A.
薄层色谱法是在薄层板上进行的一种色谱法
B.
薄层色谱法中使用的吸附剂不与欲分离物质和展开剂发生化学反应
C.
薄层色谱法具有快速、灵敏、仪器简单、操作简便之特点
D.
薄层色谱法中用于定性分析的主要依据是各斑点的Rf值与Rst值
E.
吸附薄层色谱中吸附剂的颗粒度应比吸附柱色谱中的吸附剂颗粒度粗一些
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举一反三
【单选题】The teachers are doing what they _____ their stuaits.
A.
can to teach
B.
can teach
C.
can teaching
D.
can to teaching
【单选题】“乱石穿空,惊涛拍岸,卷起千堆雪。” 这三句描写的视角先后顺序是( )
A.
仰视――俯视――近看远望
B.
仰视――俯视――远望近看
C.
俯视――仰视――近看远望
D.
俯视――仰视――远望近看
【简答题】“乱石穿空,惊涛拍岸,卷起千堆雪”这三句中哪几个字用得非常妙 ?
【简答题】“乱石穿空,惊涛拍岸,卷起千堆雪”这三句中哪几个字用得非常妙,思考作者为什么极力描绘这些景象?
【简答题】The teaching of reading will be successful if ________. A) teachers can improve conditions at school for the students B) teachers can enable students to develop their own way of reading C) teachers ca...
【判断题】乱石穿空,惊涛拍岸,卷起千堆雪。”这三句正面描写赤壁的景色,历来为人所称道。“穿”“拍”“卷”三个动词,非常富有表现力,形象地传达了赤壁两岸悬崖绝壁、直插云霄的形态,惊涛拍岸所发出巨大的涛声,以及像千堆雪一样汹涌的波涛的情状。寥寥13字,绘声、绘形、绘色,写出了赤壁壮丽的景色。
A.
正确
B.
错误
【判断题】“乱石穿空,惊涛拍岸,卷起千堆雪。”这三句正面描写赤壁的景色,历来为人所称道。“穿”“拍”“卷”三个动词,非常富有表现力,形象地传达了赤壁两岸悬崖绝壁、直插云霄的形态,惊涛拍岸所发出巨大的涛声,以及像千堆雪一样汹涌的波涛的情状。寥寥13字,绘声、绘形、绘色,写出了赤壁壮丽的景色。
A.
正确
B.
错误
【单选题】The teaching of reading will be successful if ______.
A.
teachers can improve conditions at school for the students
B.
teachers can enable students to develop their own way of reading
C.
teachers can devise the most efficient system for reading
D.
teachers can make their teaching activities observably
【单选题】The teaching of reading will be successful if ______.
A.
teachers can improve conditions at school for the students
B.
teachers can enable students to develop their own way of reading
C.
teachers can devise the most efficient system for reading
D.
teachers can make their teaching activities observable
【单选题】Our schoolmaster tried his best to make our teaching methods _____ to the concerning parents at
A.
28. Our schoolmaster tried his best to make our teaching methods _____ to the concerning parents at the press, who are eager to send their child to our school. A．get through
B.
get across
C.
get over
D.
get around
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