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目的：研究卡维地洛对麻醉兔希氏束电活动和心电活动的影响。
AIM: To investigate the effects of carvedilol on His-bundle electric activity and cardiac electric activity in anaesthetized rabbits.
GD钢中下贝氏体是由一束贝氏体铁素体片条组成的，而每一片条又是由多个贝氏体相变基元组成。下贝氏体中普遍存在中脊。
It is found that the lower bainite consists of packets of bainite ferrite plates, each plate is composed of several bainite transformation units, bainite midrib exists generally.
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