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【判断题】
省煤器的作用是利用锅炉尾部烟气的余热，加热锅炉给一种热交换设备。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】Pushing sequence of a stack is {1,2, ⋯ ,n } .If the i th number of popping sequence is j,then how many possible choices are there for the (i−1)th one? (i+j
A.
j−1
B.
i+j
C.
i+j−1
D.
i+j−2
【单选题】Given the pushing sequence of a stack as {6, 5, 4, 3, 2, 1}. Among the following, the impossible popping sequence is:
A.
2 3 4 1 5 6
B.
3 4 6 5 2 1
C.
5 4 3 6 1 2
D.
4 5 3 1 2 6
【单选题】Pushing sequence of a stack is {1,2, ⋯ ,n } .If the second number of popping sequence is i(i
A.
i−1
B.
i
C.
i+1
D.
Not sure
【单选题】Pushing sequence of a stack is {1,2, ⋯ ,n } .If the second number of popping sequence is n,then how many possible choices are there for the first one?
A.
n−1
B.
n−2
C.
n−3
D.
Not sure
【多选题】The sequence of pushing onto a stack is 1, 2, 3, 4,the sequence of pop from the stack may be( ).
A.
1,2,3,4
B.
4,3,2,1
C.
3,2,1,4
D.
4,2,3,1
相关题目：
【单选题】Pushing sequence of a stack is {1,2, ⋯ ,n } .If the second number of popping sequence is i(i
A.
i−1
B.
i
C.
i+1
D.
Not sure