皮皮学，免费搜题
登录
搜题
【单选题】
红外吸收光谱图中，下列哪组数据说明化合物中含有苯环（ ）A.
3000 ～ 2700 cm -1 3100 ～ 3000 cm -1 1100 ～ 1000 cm -1
B.
3000 ～ 2700 cm -1 2000 ～ 1750 cm -1 900 ～ 650 cm -1
C.
1650 ～ 1450 cm -1 3100 ～ 3000cm -1 900 ～ 650 cm -1
D.
1650 ～ 1450 cm -1 3100 ～ 3000 cm -1 1100 ～ 1000 cm -1
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【多选题】根据个人所得税法的相关规定，下列属于划分居民纳税人和非居民纳税人标准的有（）
A.
住所标准
B.
户籍所在地标准
C.
在中国境内居住时间标准
D.
工作地点所在地标准
【单选题】There's no doubt that modern people have less and less personal space thanks ______ beepers,cell phones and e-mail.
A.
to
B.
into
C.
off
D.
of
【单选题】Thanks to the modern technology, we can get several times ________ information _______ people did in the past.
A.
as more; as
B.
as much; than
C.
as much; as
D.
as many; as
【简答题】Thanks to the means of modern transportation and communication, the world is getting smaller and smaller. The whole world community appears to be no more than a large global village, where the residen...
相关题目：
参考解析：
知识点：
题目纠错 0
发布
