皮皮学，免费搜题
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【单选题】
不经过肝门的结构是A.
肝固有动脉
B.
肝静脉
C.
肝门静脉
D.
左、右肝管
E.
肝丛
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【单选题】—Would you like to come to my party, Sam?—I'd love to, ________I can't. I have to take a piano lesson.
A.
but
B.
till
C.
or
D.
and
【简答题】移动电子商务的模式有哪几种?
【单选题】下列关于醛酮的制备方法,描述不正确的是( )
A.
烯烃臭氧化还原水解法只能制备碳原子变小的醛或酮
B.
炔烃水合反应可以制备碳原子数不变的酮或醛
C.
傅-克酰基化反应只能制备酮，不能制备醛
D.
醇氧化法可以制备碳原子不变的醛或酮
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