เคมี, โมเลกุล, อนุภาค, โมเลกุลไฮโดรเจน, ไฮโดรเจน, ก๊าซ, องค์ประกอบ, วิทยาศาสตร์, โครงสร้างโมเลกุล, ภูมิหลัง, บทคัดย่อ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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