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【单选题】
过量氯消毒法,水中余氯含量应在A.
0 ． 5 ～ 1mg/L
B.
0 ． 3 ～ 0 ． 5mg/L
C.
0 ． 05 ～ 0 ． 3mg/L
D.
0.03~0.05 mg/L
E.
1 ～ 5mg/L
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【单选题】选择合适可以填在横线处的选项，使得可以实现查询在2019年一季度（即1月1日至3月30日）Intel公司股票收盘价大于40美元记录的功能。quotesdf['2019/01/01':'2019/03/30'][_____>40]
A.
close
B.
quotesdf.close
C.
'close'
D.
quotesdf.'close'
【简答题】A．He had some drink at home. B．He had some drink at bar. C．He behaved rudely. D．He took a breathalyzer test.
【简答题】作为一定的社会实践的产物,理想是处在( )历史条件下的人们对社会实践活动理性认识的结晶。
【简答题】A．He had some drink at home. B．He had some drink at bar. C．He behaved rudely. D．He took a breathalyzer test.
【简答题】A．He had some drink at home. B．He had some drink at bar. C．He behaved rudely. D．He took a breathalyzer test.
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