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【多选题】
薄层色谱的操作过程包括( )A.
自制薄层板或市售薄层板准备
B.
点样
C.
展开
D.
显色
E.
检视
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皮皮学刷刷变学霸
举一反三
【单选题】Nobody believed his reason for his being absent from class ___ he had to meet his uncle at the airport. [ ]
A.
why
B.
that
C.
where
D.
because
【多选题】以下属于部分预应力混凝土的缺点的是:( )
A.
与全预应力混凝土相比抗裂性略低
B.
与全预应力混凝土相比， 刚度较小
C.
与全预应力混凝土相比 设计计算略为复杂
D.
与钢筋混凝土相比，所需的预应力工艺复杂
【简答题】青霉素有哪些主要的优、缺点?
【单选题】Nobody believed his reason for being absent for
A.
33.Nobody believed his reason for being absent formthe class he had to meet his uncle at the air port. （重庆） A.why
B.
that
C.
where
D.
because
【简答题】戴维毕业于加拿大的英属哥伦比亚大学,主修英语运用语言学,研究方向第二语言学习策略 Mr. David has graduated from the University of British Columbia ,___________applied linguistic and does research on learning strategies of second language.
【简答题】分组交换的主要优、缺点是什么
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