核磁共振波谱仪的主要部件有磁铁、____、____、____样品管和记录系。
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He shows a great _______ for painting.
A. psychology
B. composition
C. aptitude
D. legibility
He believes that from a military _______, the situation is under control.
A. standpoint
B. rhythm
C. implication
D. constraint
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