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  <controlfield tag="008">210402s9999    xx            000 0 und d</controlfield>
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   <subfield code="a">Năng lượng khinh khí</subfield>
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   <subfield code="c">Ông Sử Liệt (chủ biên) ; Thi Hạc Quần (Biên soạn) ; Tống Thị Quỳnh Hoa (Biên dịch) ; Bùi Đức Hùng (Hiệu đính)</subfield>
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   <subfield code="a">Nguyên tố hydro đứng đầu tiên trong bảng tuần hoàn các nguyên tố hóa học, nó tồn tại trong nước và các loại hợp chất carbohydrate trong thế giới tự nhiên, mặt khác, Trái Đất lại là một quả &quot;cầu nước&quot; với 71% bề mặt được bao phủ bởi nước, cho nên hydro là nguyên tố phong phú nhất trên Trái Đất.</subfield>
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