电压继电器有欠压和过压继电器两种,欠压继电器吸合电压动作范围为()A、105%-12

题型:单项选择题

问题:

电压继电器有欠压和过压继电器两种,欠压继电器吸合电压动作范围为()

A、105%-120%

B、20%-50%

C、7%-20%

D、5%-20%

考点:弱电工程师弱电工程师题库
题型:单项选择题

下列选项中不符合良好程序设计风格的是( )。

A.源程序要文档化

B.数据说明的次序要规范化

C.避免滥用goto语句

D.模块设计要保证高耦合、高内聚

题型:单项选择题

阅读下列材料:

材料一:不断扩大的产品销路的需要,驱使资产阶级奔走于全球各地……这些工业所加工的,已经不是本地的原料,而是来自极其遥远的地区的原料;它们的产品不仅提供本国消费,而且提供全世界各地消费。

——《 * * 党宣言》

材料二:大洋洲有我们的牧羊场;阿根廷和北美西部草原上有我们的羊群;秘鲁送来它的白银;南非和澳大利亚的黄金流向伦敦;印度和中国人为我们种茶,而且我们的咖啡、白糖和香料种植园遍布东印度群岛。

——19世纪中期一位英国经济学家的记述

请回答:

(1)根据材料一说明资本主义列强在全球扩张的目的是什么?(5分)

(2)材料一、二反映了当时世界经济的什么特点?(5分)

(3)由材料二可以看出当时英国的世界地位如何?(4分)

题型:单项选择题

     Have you ever felt sick or had a headache during a test? Have you ever been so worried about

something that you can't sleep at night?    1   This worry in your mind can made your body feel bad. You

may feel angry, frustrated, scared, or afraid—which can give you a stomachache or a headache.

         2    Good or normal stress might happen when you're called to answer a question in class or when

you have to give a speech. This kind of stress that can help you to get things better done.    3   

     But bad stress can happen if the stressful feelings keep going over a long time.  You may not feel well

if your parents are fighting, if a family member is sick, if you're having problems at school, or if you're

going through anything else that makes you upset every day.     4    

         5    That means making good decisions about how to spend your time. If you're only dealing with

school stuff and have no time to play, you can get stressed. Make sure you keep yourself in mind: Sleep,

Exercise , Leisure(休闲),and Food. If you take care of yourself and get enough sleep and food, and if

you exercise and leave time for fun stuff, you'll probably be less stressed out!

A. However, there are two different kinds of stress.

B. Can you tell a kind of stress from another one?

C. The best way to keep stress away is to have a balanced life.

D. That kind of stress isn't going to help you, and it can actually make you sick.

E. Since bad stress is harmful for us, you'd better try to change it into good stress.

F. If so, then you know what stress is. Stress is what you feel when you are worried or uncomfortable

about something.

G. For example, you may do a better job on your test if the stress pushes you to prepare well before the

test.

题型:单项选择题

高其溶解度都增大,气体物质随温度升高其溶解度都减小。

题型:单项选择题

下列各项,不属重症SARS表现的是()

A.静息状态下呼吸频率≥30次/分

B.氧合指数低于300mmHg

C.发生休克

D.发生MODS

E.胸部X片显示为单叶病变

更多题库