問題詳情
47.水樣中含 20 mg/L 的鈣離子。請問水樣之硬度為何？
(A) 150 mg CaCO3/L
(B) 100 mg CaCO3/L
(C) 50 mg CaCO3/L
(D) 20 mg CaCO3/L
(A) 150 mg CaCO3/L
(B) 100 mg CaCO3/L
(C) 50 mg CaCO3/L
(D) 20 mg CaCO3/L
參考答案
答案：C
難度：適中0.573529
統計：A(5),B(17),C(39),D(7),E(0)
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