问题 问答题 简答题

梅兰日兰面板开关中全自动红外线感应开关(U410/L410)和声光控延时开关(U420)延时时间各是多少?如何调节?

答案

参考答案:

全自动红外线感应开关U410/L410,利用红外线技术控制原理进行全自动控制。当光线较暗时,专用传感器探测到人体红外光谱的变化,开关自动接通负载并延时到设定时间,延时时间16~400s(可随意调节),当光亮度足够时,自动抑制接通;做到人到灯亮,人离灯熄,节省能源.在开关的右侧面有两个调节旋钮,上面一个是延时时间调节旋钮,下面一个是光线强度调节旋钮,当开关被安装到墙上后,则不再可以进行调节。

声光控延时开关U420,延时时间15~300s,触发声响52分贝,不能调节。时间和光线调节同U410/L410.

完形填空

三.完形填空(共10小题,每小题2分,满分20分)

阅读下面短文,掌握其大意,然后从26-35题所给的A.B.C和D四个选项中,选出最佳 

选项,并在答题卡上将该项涂黑。

It is commonly believed that school is where people go to get education. However,it has

been said that today children  26    their education to go to school. The __27 between schooling and education suggested by this is important.  

Education is 28 _, compared with schooling. Education knows no edges. It can take place

_29_, whether in the shower or on the job, whether in a kitchen or on a tractor. It includes both the __30___ learning that takes place in schools and the whole universe of learning out of class. 31 _the experience of schooling can be known in advance, and education quite often produces surprises. A chance talk with a _32_ may lead to a person to discover how 33  he knows of another country . People obtain (获得) education from 34  on. Education, then, is a very ___35__ and unlimited term. It is lifelong experience that starts long before the start of school, and one that should be a necessary part of one’s entire life.

26.A. impress     B.  interrupt    C. issue         D. incense

27.A. difference   B. importance    C. use          D. problem

28.A. unexpected  B. endless       C. countless      D. simple

29.A. anywhere   B. anywhere else  C. somewhere    D. somewhere else

30.A. part- time   B. public        C. standard      D. strict

31.A. If          B. Because      C. So           D. Though

32.A. neighbor    B. friend        C. foreigner      D. teacher

33.A. wonderful   B. well         C. greatly        D.  little

34.A. babies      B. grown –ups   C. women        D. men

35.A. long        B. broad        C. narrow        D. short

多项选择题