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【简答题】
By saying 'Stevie soon graduated from toy instruments to real instruments', the author means that______. [A] Stevie finished his study at a toy instruments school [B] Stevie began to study in a real instruments school [C] Stevie gave up all his toy instruments and began to buy many real instruments [D] Stevie started to play real instruments
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【简答题】测得某溶液pH值为2.007,该值具有( )位有效数字
【简答题】A．It is essential to be positive about one's goal. B．It is important to score goals in life. C．It is essential to try to be a good loser. D．It is not important to keep one's goal in mind.
【简答题】测得某溶液pH值为2.007,该值具有____位有效数字
【简答题】测得某溶液 pH=2.007 ,该值具有 ________ 位有效数字,氢离子活度的正确表示为 ____________ 。
【简答题】测得某溶液pH值为2.007，该值具有______位有效数字，氢离子活度应表示为______。
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