สุขภาพ, โรค, หูฟัง, หัวใจ, ความถี่, จังหวะ, การเต้นของหัวใจ, วงจรไฟฟ้า, โบเก้, คำถาม, เครื่องหมายคำถาม
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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