阿摩線上測驗
4. A 2.5 g sample of groundwater was found to contain 5.0 ng of Cr6+, what is the concentration of Cr6+in parts per million? Cr: 52.0 u
(A)2.0 ppm
(B)0.2 ppm
(C)0.02 ppm
(D)0.002 ppm
(E)0.0002 ppm
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統計： A(2), B(2), C(2), D(11), E(0) #2430658
統計： A(2), B(2), C(2), D(11), E(0) #2430658
詳解 (共 2 筆)
面試倒楣鬼-22幸運上後西
#4934319
5ng/2.5g = 2*10-9 = (D)
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