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问题
选择题
一组数据1,-1,2,5,6,5的极差是( )
A.4
B.5
C.6
D.7
答案
答案:
D
选择题
I can never forget the day ______ we worked together and the day ______ we spent together.
A. when; which
B. which; when
C. what; that
D. on which; when
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单项选择题 A1型题
《中国药典》规定马钱子粉中马钱子碱的含量不得少于()
A.0.15%
B.0.50%
C.0.75%
D.1.15%
E.2.0%
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