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问题 单项选择题

某公司所有的销售人员都是男性，所有的文秘都是女性，所有的已婚者都是文秘，公司的总经理尚未结婚。据此，我们可以知道（）。

A.总经理是男性

B.已婚者中有男性

C.女员工中可能有未婚者

D.销售人员中有的已经结婚

答案

参考答案：C

解析：

考查概念间的关系。由题干可画图如下：由图可知，总经理也可能是女性，A项错误；已婚者都是女性，B项错误；女员工中可能有未婚者，C项正确；销售人员都未婚，D项错误。故选C。

单项选择题

The Turing machine is an abstract (71) of computer execution and storage introduced in 1936 by Alan Turing to give a mathematically precise definition of (72) . or ’mechanical procedure’. As such it is still widely used in theoretical computer science, especially in (73) theory and the theory of computation. The thesis that states that Turing machines indeed capture the informal notion of effective or mechanical method in logic and mathematics is known as Turing’s thesis.

Every Turing machine computes a certain (74) partial function over the strings over its alphabet. In that sense it behaves like a computer with a fixed program. However, as Alan luring already described, we can encode the action table of every Turing machine in a string. Thus we might try to construct a Turing machine that expects on its tape a string describing an action table followed by a string describing the input tape, and then computes the tape that the encoded Turing machine would have computed. As Turing showed, such a luring machine is indeed possible and since it is able to simulate any other Turing machine it is called a (75) Turing machine.

A universal Turing machine is Turing complete. It can calculate any recursive function, decide any recursive language, and accept any recursively enumerable language. According to the Church-Turing thesis, the problems solvable by a universal Turing machine are exactly those problems solvable by an algorithm or an effective method of computation, for any reasonable definition of those terms.

（75）处填（）。

A．universal

B．special

C．complete

D．changeable
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单项选择题

集输站场内泄漏原则上不允许点火，控制势态不扩大为原则。在泄漏局面可以控制的前提下，要采取（）的措施。

A.泄压

B.点火

C.灭火

D.保压
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