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【多选题】
按照固定支持剂种类不同，可把色谱法分为A.
氧化铝色谱
B.
硅胶色谱
C.
聚酰胺色谱
D.
气相色谱
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举一反三
【单选题】《中药品种保护条例》规定，中药一级保护品种的保护期限分别为
A.
三十年、二十年、十年、
B.
二十年、十年、八年、
C.
二十年、十年、八年、
D.
二十年、十年、五年、
E.
十年、五年、三年、
【单选题】在下列哪种情况下需要引用绝对地址
A.
当把一个含有单元格地址的公式拷贝到一个新的位置时，为使公式中单元格地址随新位置而变化
B.
当在引用的函数中填入一个范围时，为使函数中的范围随地址位置不同而变化
C.
当把一个含有范围的公式或函数拷贝到一个新的位置时，为使公式或函数中范围随新位置不同而变化
D.
当把一个含有范围的公式或函数拷贝到一个新的位置时，为使公式或函数中范围不随新位置不同而变化
【单选题】Why did the writer want to send letters to his father?
A.
To express gratitude to him.
B.
To show his father what his life is like
C.
Because he miss his father
D.
To tell him about his recent personal experience
【单选题】Why did the author’s father push him to practice the accordion?
A.
Because his father himself didn’t get to play the violin when he was a kid.
B.
Because his father believed that music could touch the hearts of the people.
C.
Because the spell of music could make his father feel relaxed.
D.
Because his father discovered that his son had a great talent for music.
【单选题】盐酸小檗碱少许,加水5ml,缓缓加热溶解后,加5%氢氧化钠溶液2滴,再加丙酮4滴,即生成( )黄色沉淀 即为丙酮小檗碱。
A.
白色
B.
黄色
C.
橙色
D.
樱红色
【单选题】Why did the author's father push him to practice the accordion?
A.
Because his father himself didn't get to play the violin when he was a kid.
B.
Because his father believed that music could touch the heart of the people.
C.
Because the spell of the music could make his father relaxed.
D.
Because his father discovered that his son had a great talent for music.
【简答题】根据《中药品种保护条例》规定A. 可申请中药品种一级保护的是B. 可申请中药品种二级保护的是
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