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2) At age 15, when the speaker didn’t have enough money to buy a new computer, his mother said nothing because she wanted him to learn his 1.______2.______ and manage his 3._____ 4.______.
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3) Now the speaker realizes how his mother has prepared him. She’s respected his 1._____________ , and has made sure he could understand his 2.______ 3._______ and has let him know that she’ll always be there to catch him when he 4._______ .
酸碱平衡紊乱时，中枢抑制性介质增多，主要与下列哪组酶活性的变化有关 (1分)
慢性呼吸性酸中毒时肾代偿的主要机制是 (1分)
下列哪项物质不是固定酸 (1分)
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