IR中,α-吡喃酮环的羰基特征吸收峰应在()
A.酚羟基
B.内酯环结构
C.1745~1715cm-1
D.甲氧基
E.3600~3200cm-1
参考答案:C
Everyone wants to live in a beautiful, comfortable and “livable” place, but not ______ know where it is.
A.all
B.some
C.either
D.both
()不属于OLAP技术的三维数据。
A.管理技术维
B.时间维
C.销售渠道维
D.地区维