学号分别为1、2、3、4、5的五个学生在计算机机房操作编号分别为1_爱下问搜题

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问题填空题

学号分别为1、2、3、4、5的五个学生在计算机机房操作编号分别为1、2、3、4、5的计算机．如果第i学号的学生操作第j号的计算机，规定记作为a_ij=1，否则a_ij=0（一台计算机可以允许多个学生合作操作），现有等式a₁₁a₂₂a₃₃a₄₄a₅₅=0，那么等式说明______．（用文字语言表述）

答案

由题意，a₁₁a₂₂a₃₃a₄₄a₅₅=0说明a₁₁a₂₂a₃₃a₄₄a₅₅中至少有一个为0，

即至少有一个学生在操作与之学号不同编号的计算机．

故答案为：至少有一个学生在操作与之学号不同编号的计算机．

完形填空

The job of raising children is a tough one. Children don’t come with an instruction manual(说明书). And each child is 36 . So parents sometimes pull their hair out in frustration(挫折), not 37
what to do. But in raising children—as in all of life—what we do is 38 by our culture. Naturally then, American parents teach their children basic American 39 . To Americans, the goal of parents is to help children 40 on their own two feet. From 41 each child may get his or her own room. As children grow, they get more 42 to make their own choices. 43 choose their own forms of entertainment, as well as the friends to 44 them with. When they 45 young adulthood, they choose their own jobs and marriage 46 . Of course, many young adults still 47
their parents’ advice and approval for the choices they make. But once they “leave the 48 ” at around 18 to 21 years old, they want to be on their own , not 49 to their mother’s apron strings (围裙带). The relationship between parents and children in America is very informal. American parents try to 50 their children as individuals—not as extensions of themselves. They allow them to achieve their own 51 . Americans praise and encourage their children to give them the 52
to succeed. When children become adults, their relationship with their parents becomes more like a (an) 53 among equals. But 54 to popular belief, most adult Americans don’t make their parents pay for room and board when they come to 55 . Even as adult, they respect and honor their parents.

D．association

单项选择题

APU提供引气时不要使用哪种装置以免引气系统受损坏（）

A.低压地面装置

B.高压地面装置

C.发动机引气