通常取()作为断线报警值。 A.1mA B.2mA C.3mA D.4mA

题型:单项选择题

问题:

通常取()作为断线报警值。

A.1mA

B.2mA

C.3mA

D.4mA

考点:智能楼宇管理师考试智能楼宇管理员(四级)智能楼宇管理员(四级)题库
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二次函数f(x)=ax2+bx+1,(a>0),设f(x)=x的两个实根为x1,x2

(1)如果b=2且|x2-x1|=2,求a的值;

(2)如果x1<2<x2<4,设函数f(x)的对称轴为x=x0,求证:x0>-1.

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短文改错(满分10分)

下面短文中共有10处错误,每句中最多有两处。错误涉及单词的增加、删除或修改。

增加:在缺词处加一个漏词符号(∧),并在此符号下面写出该加的词。

删除:把多余的词用斜线(\)划掉。

修改:在错的词下划一横线,并在该词下面写出修改后的词。

注意:1、每处错误及其修改均仅限一词;

2、只允许修改10处,多者(从第11处起)不计分

On Saturday afternoon, Li Hua and Wang Ping, members from “ Green Eyes”, was having an environmental protection activity near the riverside when they catch sight of a bird on the ground.

They picked it out and found it wounded.Thinking it might die without timely help, they took it to home.They made a nest for it but fed it with rice and water.Under their treatment and care, the lucky birds got recovered soon.When time came for them fly the bird back to nature, they felt a bit pity but very delighting.

I think it’s worthwhile for him to do such a thing.Here I call on the public to show respect for nature.Only by changing the way we treat the environment can we get along good with it.

题型:单项选择题
1930年劳伦斯制成了世界上第一台回旋加速器,其原理如图所示,这台加速器由两个铜质D形盒D1、D2构成,其间留有空隙,下列说法正确的是(  )

A.回旋加速器只能用来加速正离子

B.离子从D形盒之间空隙的电场中获得能量

C.离子在磁场中做圆周运动的周期是加速交变电压周期的一半

D.离子在磁场中做圆周运动的周期是加速交变电压周期的2倍

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贷款人应通过借款合同的约定,要求借款人指定()账户并及时提供该账户资金进出情况。

A、资金回笼

B、个人或单位存款

C、贷款发放

D、资金管理

题型:单项选择题

一般情况下,男子不宜佩戴的饰物是:()

A、戒指

B、项链

C、耳环

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