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【单选题】
According to the passage, what is the purpose of China's geological research?
A.
To develop China's mining industry.
B.
To develop China's heavy industry.
C.
To develop China's oil industry.
D.
To distribute minerals evenly in China.
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B.
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A.
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B.
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D.
过滤设备
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A.
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B.
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A.
div:nth-child(even)   p{background:red}
B.
div p:nth-child(even){background:red}
C.
div p:nth-child(odd){background:red}
D.
div:nth-child(odd)   p{background:red}
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A.
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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【多选题】液 - 液萃取设备包括( )( )( )三个部分
A.
混合设备
B.
分离设备
C.
溶剂回收设备
D.
过滤设备
【简答题】轴向混合导致两液相的 ,使两液相在萃取设备内的停留时间偏离 。轴向混合包括 和 。
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