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【多选题】
霍夫曼(Hofmann)重排、(Curtius T)重排和斯密特(Schmidt K F)重排的机理类似,都经过相同的两种活泼中间体:( )A.
乃春
B.
异氰酸酯
C.
碳烯
D.
碳负离子
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【单选题】听力原文： Hello, ladies and gentlemen, this is your captain speaking. You are on board Flight 1125 heading for Los Angeles and scheduled to arrive at 20:46 Western Daylight Savings Time. We are currently ...
A.
About 4 hours.
B.
About 11 hours.
C.
About 15 hours.
D.
About 20 hours.
【简答题】在公差为 d 的等差数列{ a n }中，已知 a 1 ＝10，且 a 1, 2 a 2 ＋2,5 a 3 成等比数列． (1)求 d ， a n ； (2)若 d <0，求| a 1 |＋| a 2 |＋…＋| a n |.
【简答题】S1:When security level 2 or 3 is get by the port facility you are visiting and the information was communicated to you ,what should you do on board?S2:According to the ISPS code ,I shall acknowledge t...
【简答题】苗语属于( )语系( )语族的( )语支的语言。
【单选题】You are kindly requested to supply the necessary tallymen to do ______ on board the ship during the discharging of the cargo.
A.
the tallymen work
B.
the lashing work
C.
the cleaning work
D.
the work of opening and closing hatches
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