搜题请搜索小程序“爱下问搜题”
问题 填空题

将二次函数y=2x2﹣1的图象沿y轴向上平移2个单位，所得图象对应的函数表达式为　      　．

答案

y=2x2+1

题目分析：∵二次函数y=2x2﹣1的图象沿y轴向上平移2个单位，

∴所得图象对应的函数表达式为：y=2x2﹣1+2=2x2+1．

故答案为：y=2x2+1．

选择题

关于磁感应强度，下列说法正确的是(　　)

A．由B＝可知，磁场中某处的磁感应强度大小随通电导线中电流I的减小而增大

B．由B＝可知，磁场中某处的磁感应强度大小随通电导线所受磁场力F的增大而增大

C．通电导线所受的磁场力为零，该处的磁感应强度不一定为零

D．放置在磁场中1 m长的通电导线，通过1 A的电流受到的力为1 N，则该处的磁感应强度就是1 T
查看答案
单项选择题

Losing a job or not being able to find one almost always brings unwelcome changes. If you’ve lost a job, the first feeling is often one of shock. On top of the loss of income, many people find the whole routine of their life is shattered, their contact with other people reduced, their ambitions halted and their identity as a worker removed.
There may be good feelings too—it’s nice to be able to lie in bed in the morning, to spend more time with children, or to have more time to think—a better job may be just around the corner. But, unless a better job does turn up, chances are the days start getting longer and the time becomes harder to fill. Many people pass through periods of difficulty in sleeping and eating. They feel irritable and depressed, often isolated and lonely.
Despite all these problems, unemployment can be a chance for a fresh start. You can discover that it provides an opportunity to sort out or rethink what you want from life and how best you can get it. You can use the time to plan how to find a new job, learn a new skill, develop your hobbies, see if you can run your own business, do some voluntary work in your community or meet new people. It’s up to you.

According to the passage, possible good feelings include the following EXCEPT being able to ______.

A．have more time to think

B．have a new and better job

C．have more time to visit friends

D．spend more time with children
查看答案