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【单选题】
下列物质中能组成共轭酸碱对的是( )A.
H 3 PO 4 和 PO 4 3-
B.
H 2 S 和 S 2-
C.
NaOH 和 Na +
D.
H 2 CO 3 和 HCO 3 -
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反馈参考答案：
举一反三
【简答题】·曲柄连杆机构在运动过程中受( )的作用。A. 气体作用力 B·摩擦力 C·运动质量惯性力 D·外界阻力
【简答题】Later when the children came home for the week of Christmas, the house was bright with Christmas colours.
【简答题】Except for a number of stores ______ (主要街道两边), the others are closed on Christmas Day.
【简答题】Christmas is a time of all others when want is keenly felt, and abundance rejoices.
【简答题】市盈率是评价上市公司盈利能力的指标，它反映投资者愿意对公司每股净利润支付的价格。（ ）
【单选题】In 'LoveActually', Harry is not happy with ()when he is doing Christmas shopping with his wife.
A.
Mia
B.
the sales clerk
C.
his employee
D.
his child
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