已知一不确定的有限自动机(NFA)如图2-8所示，采用子集法将其确定化为DFA的过程如表2-1所示。

状态集T1中不包括编号为(23)的状态；状态集T2中的成员有(24)：状态集T3等于(25)；该自动机所识别的语言可以用正规式(26)表示。
A．2
B．4
C．3
D．5

We（）last night，but we went to the concert instead.

A.must have studied
B.might study
C.should have studied
D.would study

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One of the guidelines in writing the C code for a software tool is as follows: write code that is as clear and as simple a(76). The C language can be difficult to read if you combine all(77)features in a single statement. Break complicated(78)into several easy to understand statements for the(79)of readability. This style. helps to make your programs more(80)and error-free.A．readableB．reusableC．possibleD．semanticE．syntactic

A.
A．readable
B．reusable
C．possible
D．semantic
E．syntactic

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