BOOMbox爆炸机测量井口显示“Geo>800”时表示()。A、检波器线缆短路 B、

题型:单项选择题

问题:

BOOMbox爆炸机测量井口显示“Geo>800”时表示()。

A、检波器线缆短路

B、检波器正常

C、检波器开路

D、检波器阻值800欧

考点:石油地震勘探工石油地震勘探工高级石油地震勘探工高级题库
题型:单项选择题

用万用表不同欧姆档测量二极管正向电阻时,会观察到其测得的阻值不同,其根本原因是______。

A.万用表不同的欧姆档有不同的阻值
B.二极管有非线性的特性
C.二极管的质量差
D.以上都不对

题型:单项选择题

下面文中共有10处语言错误,错误涉及一个单词的增加、删除或修改。

增加:在缺词处加一个漏字符号(∧),并在其下面写出该加的词。

删除:把多余的词用斜线(\)划掉。

修改:在错的词下划一横线,并在其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。

It seems that there are a larger number of beggar in the

 streets than there used to be. I don’t know how we should help

 it or not. Once I gave some money to a beggar who looks

 poor. However, minutes later, I saw him bought some

cigarettes. It really shocked at me. In my opinion, anyone who

work hard can make a living. I’m afraid that giving them

money isn’t best way to help them. Maybe the government

can take some action to helping them. Anyway, if they

 want to live a better living, they should learn to depend

 on themselves.

题型:单项选择题

下列实验操作正确的是[ ]

A.

B.

C.

D.

题型:单项选择题

下列鱼类中鳃裂腹位的是()。

A.黑线银鲛

B.赤魟

C.鲸鲨

D.食人鲨

题型:单项选择题

U480(风机盘管调节开关)定货后是否已带边框?如果想带彩色边框应如何订货?

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