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【单选题】
若元素a,b,c,d,e,f依次进栈，允许进栈、退栈操作交替进行。但不允许连续三次进行退栈工作，则不可能得到的出栈序列是（ ）A.
dcebfa
B.
cbdaef
C.
dbcaef
D.
afedcb
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【单选题】Birth of JesusThis is how the birth of Jesus Christ took place. When Mary his mother was engaged to Joseph, before they were married, she became pregnant by the Holy Spirit. Joseph her husband was a r...
A.
A kind of animal
B.
A kind of furniture
C.
A kind of food
D.
A kind of flavor
【简答题】在Excel 2007中，将C1单元中的公式=A1+B2复制到A5单元后，E5单元中的公式是( )。
【单选题】I am used ______ by air and only on one occasion have I ever felt frightened.
A.
to travel
B.
to traveling
C.
traveling
D.
to have traveled
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