搜题请搜索小程序“爱下问搜题”
问题 单项选择题

室内分布系统覆盖范围内95%的位置上所测得的手机接收信号强度要求不得低于（），电梯内信号强度不得低于（）

A.-90dBm和-93dBm

B.-85dBm和-90dBm

C.均为-93dBm

D.-85dBm和-93dBm

答案

参考答案：B

单项选择题

锅炉压力表表盘大小应保证锅炉人员能清楚地看到压力指标值，表盘直径不应小于( )mm。

A．10

B．50

C．80

D．100
查看答案
单项选择题

If you are like most people, your intelligence varies from season to season. You are probably a lot sharper in the spring than you are at any other time of the year. A noted scientist, Ellsworth Huntington (1876-1947), concluded from other men’s work and his own among peoples in different climates that climate and temperature have a definite effect on our mental abilities.
He found that cool weather is much more favorable for creative thinking than is summer heat. This does not mean that all people are less intelligent in the summer than they are during the rest of the year. It does mean, however, that the mental abilities of large numbers of people tend to be lowest in the summer.
Spring appears to be the best period of the year for thinking. One reason may be that in the spring man’s mental abilities are affected by the same factors that bring about great changes in all nature.
Fall is the next-best season, then winter. As for summer, it seems to be a good time to take a long vacation from thinking!

One possible reason why spring is the best season for thinking is that ______.

A．all nature, including man, is growing then

B．it lasts longer than the other seasons

C．it is not too warm and not too cold

D．both B and C
查看答案