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【单选题】
What does James like about his job as a nanny?A.
He has received encouragement from his friends.
B.
He can easily do better than women nannies.
C.
He has more freedom to plan his own work.
D.
He is allowed to try out unusual methods.
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皮皮学刷刷变学霸
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【简答题】计算 CaF 2 在 pH = 2.00 , 含 Ca 2+ 浓度为 0.10 mol/L 溶液中的溶解度。 ( 已知 : p K sp = 10.57 , HF 的 p K a = 3.18 )