氧化还原反应在生产、生活中具有广泛的用途,下列生产生活中的事例不属于氧化还原反应的是( )
A.金属冶炼
B.燃放鞭炮
C.食物腐败
D.用汽油除去油污
答案:D
—Could you go swimming with us this afternoon?
—Sorry, I can't. I take care of my little sister because my mother is ill. [ ]
A. have to
B. can
C. may
D. would
对心、脑组织毒性最低的对比剂是
A.胆影葡胺
B.泛影葡胺
C.复方泛影葡胺
D.碘酞葡胺
E.甲泛葡糖