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【单选题】
如图,已知AB∥CD,AD和BC相交于点O,∠A= ,∠AOB= ,则∠C等于
A.
B.
C.
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【单选题】How many steps are there in the solution?
A.
6
B.
5
C.
4
D.
3
【单选题】According to the text, how many steps are usually adopted to implement public relation plans?
A.
Three.
B.
Five.
C.
Eight.
D.
Net mentioned.
【简答题】按自然数从小到大为标准次序,求下列个排列的逆序数。 1、1234 2、4132 3、3421 3、2413 5、13...(2n-1)24...(2n)
【单选题】按自然数从小到大为标准次序,求排列3421的逆序数
A.
2
B.
5
C.
1
D.
4
【简答题】按自然数从小到大为标准次序,求下列各排列的逆序数: (1)1234;    (2)4132;    (3)3421;    (4)2413; (5)13…(2n-1)24…(2n); (6)13…(2n-1)(2n)(2n-2)…2。
【单选题】How many steps in Delegating?
A.
2
B.
3
C.
4
D.
5
【单选题】How many steps should you take for this course?
A.
One step, just sign up for the course .
B.
Two steps: turn on my laptop and shut down my laptop.
C.
Three steps: preview , attend class discussions and review.
D.
Four steps: sign up for this course , sign up in the class discussions, play video games or chatting and get credit.
【简答题】按自然数从小到大为标准次序,求下列各排列的逆序数: (1)3421的逆序数为 (2) 的逆序数为
【单选题】How many steps are there in the SOP?
A.
3
B.
4
C.
2
D.
1
【单选题】习题一第 2 ( 3 ) 题 排列3421的逆序数为:
A.
-5
B.
5
C.
0
D.
10
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