盐酸氯丙嗪在空气中放置易氧化变色,这是因为分子中有()
A.吩噻嗪环
B.芳伯胺基
C.巯基
D.叔胺基团
E.苯环
参考答案:A
Mr. Xue enjoyed ________ by working in Yangzhou-Taizhou Airport because he always hates ________ while staying alone at home all day long.
A.itself; that
B.himself; it
C.it; it
D.him; that
下列哪一种不属于中央与地方财力划分的理论依据()
A、预算制订的分工
B、资源配置职能的分工
C、收入分配职能的分工
D、经济稳定职能的分工