问题 问答题 简答题

对照明灯及其使用规定? 

答案

参考答案:

(1)局部照明一般采用36伏及以下等级的安全电压。

(2)灯具高度一般不低于2.5米,低于2.2米时,应采取适当的安全措施。

(3)灯具安装必须牢固可靠,灯具、镇流器等发热设备,应和可燃物保持必要的安全距离或采取隔热措施。

(4)所装设的照明开关,应便于操作,照明插座和开关离地面高度以不小于1.5米为宜。

(5)螺口灯头的接线必须正确,螺旋部分接工作零线,弹簧舌片接相线,使用灯泡超过150瓦,应采用瓷灯头,不得采用胶木灯头,不宜采用带有开关或插座的灯头。

(6)照明线路开关应能同时切断相线和零线,零线经过开关和熔断器,变成专用工作零线,不得再从此线上引出保护零线,相线经过开关和熔断器后,可在分支相线上装单极开关,控制单个照明。

(7)有触电危险的场所以及住宅,严禁装设床头开关。

单项选择题
单项选择题

The amazing success of humans as a (91) is the result of the evolutionary development of our brains which has led, among other things, to tool-using, tool-making, the (92) to solve problems by logical reasoning, thoughtful cooperation, and language. One of the most striking ways in which chimpanzees biologically (93) humans (94) in structure of their brains. The chimpanzee, with the capacity for (95) reasoning, (96) a type of intelligence more like that of humans than (97) any other mammal living today. The brain of the modern chimpanzee is probably not too dissimilar (98) the brain that so many millions of years ago (99) the behavior of the first ape man.
For a long time, the fact that prehistoric people made (100) was considered to be one of the major (101) distinguishing them from other creatures. (102) pointed out earlier, I have watched chimpanzees (103) grass stems in order to use them to probe for termites. It is tree that the chimpanzee does not (104) tools to "a regular and set pattern"—but then, (105) people, before their development of stone tools, undoubtedly poked around (106) sticks, and straws, at which stage it seems (107) , that they made tools to a set pattern either.
It is because of the close (108) in most people’s minds of tools with humans (109) special attention has always been focused upon any animal able to use an object as a tool: but it is important to realize that this ability, on its own, does not necessarily indicate any special intelligence in the creature (110) .

A.modify

B.transform

C.convert

D.transfigure