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【单选题】
下列说法中正确的个数有（ ） ① 23 7 无理数 ②无理数是无限不循环小数 ③ 9 的算术平方根是3 ④与数轴上的点一一对应的是实数．A.
4个
B.
3个
C.
2个
D.
1个
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A.
To carry out a scientific survey.
B.
To establish a new research station.
C.
To rescue two sick American workers.
D.
To deliver urgent medical supplies.
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A.
University Several Bus
B.
Universal Several Bus
C.
Universal Serial Bus
D.
University Serial Bus
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A.
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B.
市场经济需要具有职业技能的高素质劳动者
C.
市场经济需要具有先进职业理念的高素质劳动者
D.
市场经济需要有身价的高素质劳动
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A.
谋取 兑现 排除 格局
B.
牟取 实现 剔除 局面
C.
谋取 实现 剔除 格局
D.
牟取 兑现 排除 局面
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