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【简答题】
将 展开成正弦级数和余弦级数.
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反馈参考答案：
举一反三
【多选题】在气相色谱填充柱制备操作时应遵循的原则是( )。
A.
尽可能筛选粒度分布均匀的载体和固定相
B.
保证固定液在载体表面涂渍均匀
C.
保证固定相在色谱柱填充均匀
D.
避免载体颗粒破碎和固定液的氧化作用
【简答题】The friendship conveyed in the gift seems to be the most (value) __________ thing.
【简答题】One thing that leads us ________ here is that the selector seems to be in a position of power.
【单选题】One thing seems certain, which is that history and biology ____ tears.
A.
go hand in hand with
B.
side with
C.
put emphasis on
D.
put emphasis on
【单选题】According to the first paragraph, the author seems to think that
A.
it is a wonderful thing to live with both sexes
B.
studying with only one's own sex is helpful for academic achievements
C.
only gays will feel happy about being surrounded by the same sex
D.
parents try to protect their children by sending them to same sex schools
【单选题】What seems to be the most important thing you have to decide on before a meeting starts? ______
A.
The length of the agenda
B.
The frequency of the meetings
C.
A specific objective to accomplish
D.
Operational issues
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