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ç©è´¨çéæµåº¦ä¸º0.3 umol/Lï¼å¯¹ååè´¨é为390ï¼å³ æ©å°è´¨éM= 390 ug/umol
ã2ãç©è´¨çéä¸è´¨éçæ¢ç®ï¼ m = 0.3 umol x390 ug/umol = 117ug = 0.117mg
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è´¨éæµåº¦ p = m/V = 0.117mg/L