与"first heart sound"相近的词条

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• first grade prize
• first half of QRS complex
• first harmacopoeia in ancient China
• first harmonic
• first harmonic Fourier anaylsis
• first heart sound
• first-hundred-day infant cough
• first impression
• first-in first-out
• first-in-last-out principle
• first incisor
• first incubation period
• first in,first out
• first inner apical nervure
• first intention
• first intermediate host

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