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问题 解答题

已知-23m+1与4xn-6y-3-m的积与-x4y是同类项，求m，n的值．

答案

∵-23m+1与4xn-6y-3-m的积与-x4y是同类项，

∴4xn-6y-3-m与x4y是同类项，

∴n-6=4，-3-m=1，

∴n=10，m=-4．

问答题 论述题

压力对合成氨生产的影响？
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单项选择题

Object-oriented analysis （OOA） is a semiformal specification technique for the object-oriented paradigm. Object-oriented analysis consists of three steps. The first step is（）.It determines how the various results are computed by the product and presents this information in the form of a（）and associated scenarios. The second is（）, which determines the classes and their attributes, then determines the interrelationships and interaction among the classes. The last step is（）, which determines the actions performed by or to each class or subclass and presents this information in the form of（）.

It determines how the various results are computed by the product and presents this information in the form of a （） and associated scenarios.

A．collaboration diagram

B．sequence diagram

C．use-case diagram

D．activity diagram
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