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【单选题】
已知S 2 O 8n － 离子和H 2 O 2 一样含过氧键，因此也有强氧化性，S 2 O 8n － 离子在一定条件下可把Mn 2+ 氧化成MnO 4 － 离子，若反应后S 2 O 8n － 离子生成SO 4 2－ 离子；又知反应中氧化剂与还原剂的离子数之比为5：2则S 2 O 8n － 中的n值和S元素的化合价是 [ ]A.
2, +7
B.
2, +6
C.
4 ,+7
D.
4 , +4
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【简答题】n. 丑闻 首字母s
【简答题】物业管理专业学生在学习过程中会有两个重要实习,分别是( )和( ),这两门课同时也是物业管理专业的专业核心课。
【单选题】The main reason why two major airlines went bankrupt recently was that
A.
the recession had reduced the overall number of air passengers.
B.
the companies failed to attract an adequate number of passengers.
C.
competitions from other airliners took away all their trade.
D.
they introduced cheap flights for all categories of passengers.
【简答题】In the meantime, consumers are forced to make a choice between just two US and two UK airlines, which provide 95 percent of transatlantic services from Heathrow.
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