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问题:

[问答题,简答题] 简述小学生学习兴趣的发展特点。

导致支气管平滑肌舒张的肾上腺素能受体为() ["α受体","β受体","β受体","M受体","N1受体"] 杆形卡环不具备的优点是()。 ["弹性好","固位作用好","对基牙损伤小","不易存积食物","基牙可保持生理运动"] 有补火助阳,散寒止痛,温经通脉功效的药物是() ["附子","肉桂","小茴香","吴茱萸","干姜"] 导致冠状血管收缩的肾上腺素能受体为() ["α受体","β受体","β受体","M受体","N1受体"] 有温中散寒,回阳通脉,温肺化饮功效的药物是() ["A.附子","B.肉桂","C.小茴香","D.吴茱萸","E.干姜"] 简述小学生学习兴趣的发展特点。
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