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【单选题】
某天然水体的 pH 是 8.0 ,水中碳酸的主要形态是( ).A.
H 2 CO 3 *
B.
HCO 3 —
C.
CO 3 2-
D.
CO 2
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反馈参考答案：
举一反三
【简答题】淘宝的浏览转化率是()、购买转化率是()。(注意:保留小数点后两位,用%号表示)
【单选题】某同学设计高精度数控机床的传动系统,应按照哪种原则进行各级传动比分配?( )
A.
等效转动惯量最小原则
B.
输出轴转角误差最小原则
C.
质量最小原则
D.
上述均可
【单选题】She moved away from her parents, and missed them ______enjoy the exciting life in New York.
A.
too much to
B.
enough to
C.
very much to
D.
so much to
【简答题】She moved away from her parents, and missed them __________ enjoy the exciting life in New York. A) too much to B) enough to C) very much to D) so much to
【单选题】She moved away from her parents, and missed them __________ enjoy the exciting life in New York.
A.
too much to
B.
enough to
C.
so much to
D.
very much to
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