A.He worked as a sales-assistant in a clothing shop. B.He was the manager of a clothing shop. C.He worked in a laundry. D.He. was a lifeguard in a swimming pool.
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举一反三
【单选题】3-2、0.010 mol/L N H 4 C l 和 0.2 mol/L N H 3 . H 2 O 缓冲溶液的PH值为( ).