The physical meaning and characteristic of reference frame power are illustrated in detail.
推导了功率表达式，阐明了参考坐标系功率的物理意义和特性。
The characteristic finding on physical exam is a mid-systolic click.
体格检查时发现的收缩中期期卡嗒音为其特征表现。
The characteristic finding on physical exam is a mid-systolic click.
体格检查时发现的收缩中期期卡嗒音为其特征表现。
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