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| 十亿分之一 (ppb) | |||
| 十亿分之…; 十亿分率 | |||
| 十亿分之— | |||
| 十亿分之一 (10 ~9); 十亿分之... (X10⁻⁹); 十亿分之..... (X10⁻⁹) | |||
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| 十亿分率; 十亿分之…美、法计数制 | |||
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