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第一讲单元测验：《组织行为学》概述

1、单选题：
‎组织行为学是研究下述哪方面规律性的科学(  )‌
选项：
A: 一切人的心理活动
B: 一切人的行为
C: 组织内的人的心理与行为
D: 一切人的心理与行为
答案: 【 组织内的人的心理与行为】点我阅读全文

第一周单元测验

1、单选题：
‎桥梁按体系划分可分为‌
选项：
A: 梁桥、拱桥、悬索桥、组合体系桥
B: 简支梁桥、悬臂梁桥、连续梁桥、连续刚构桥
C: 木桥、钢桥、圬工桥、钢筋砼桥、预应力砼桥
D: 公路桥、铁路桥、人行桥和农用桥
答案: 【 梁桥、拱桥、悬索桥、组合体系桥】点我阅读全文

TestforModelI

1、单选题：
​What class of ticket would you like，______ class or business class? 那你需要定什么舱位的机票（经济舱还是商务舱）？​
选项：
A: economy
B: economic
C: economical
D: economics
答案: 【 economy】点我阅读全文

第一章 概论测验

1、单选题：
‎‌‎欧洲海关大会在定义国际运输中所使用的托盘时，表述的是该设备‌‎‌‎‌
选项：
A: 一般包括被托架分开的两个层面或由支脚支撑的单层
B: 其总高度恰好适于利用叉车和托盘对其进行搬运
C: 可以有或没有上层结构
D: 上述三项都是
答案: 【 上述三项都是】点我阅读全文

第一章 单元测试

1、单选题：
‌人类学会（ ）是化学的发端。‎
选项：
A: 用火
B: 制陶
C: 造纸
D: 炼铁
答案: 【 用火】点我阅读全文

熟识电梯安全保护单元测验

1、单选题：
‏超速保护装置为：​
选项：
A: 限速器、安全钳
B: 强迫减速开关
C: 缓冲器
D: 终端限位开关
答案: 【 限速器、安全钳】点我阅读全文

测试

1、单选题：
‌客户关系管理的简称是​‌​
选项：
A: SCM
B: CCM
C: CRM
D: ERP
答案: 【 CRM】点我阅读全文

随堂测验

1、单选题：
在八脉交会穴中，通冲脉的是( )‏‎‏
选项：
A: 列缺
B: 公孙
C: 内关
D: 商丘
答案: 【 公孙】点我阅读全文

test10

1、单选题：
Read a text about 'Wind Power in the US' and answer some questions.‌ ‌Wind Power in the US‌Prompted by the oil crises of the 1970s, a wind-power industry flourished briefly in the United States. But then world oil prices dropped, and funding for research into renewable energy was cut. By the mid 1980s US interest in wind energy as a large-scale source of energy had almost disappeared. The development of wind power at this time suffered not only from badly designed equipment, but also from poor long-term planning, economic projections that were too optimistic and the difficulty of finding suitable locations for the wind turbines.‌Only now are technological advances beginning to offer hope that wind power will come to be accepted as a reliable and important source of electricity. There have been significant successes in California, in particular, where wind farms now have a capacity of 1500 megawatts, comparable to a large nuclear or fossil-fuelled power station, and produce 1.5 per cent of the state’s electricity.‌Nevertheless, in the US, the image of wind power is still distorted by early failures. One of the most persistent criticisms is that wind power is not a significant energy resource. Researchers at the Battelle Northwest Laboratory, however, estimate that today wind turbine technology could supply 20 per cent of the electrical power the country needs. As a local resource, wind power has even greater potential. Minnesota’s energy commission calculates that a wind farm on one of the state’s south western ridges could supply almost all that state’s electricity. North Dakota alone has enough sites suitable for wind farms to supply more than a third of all electricity consumed in the continental US.‌The prevailing notion that wind power is too costly results largely from early research which focused on turbines with huge blades that stood hundreds of metres tall. These machines were not designed for ease of production or maintenance, and they were enormously expensive. Because the major factors influencing the overall cost of wind power are the cost of the turbine and its supporting systems, including land, as well as operating and maintenance costs, it is hardly surprising that it was thought at the time that wind energy could not be supplied at a commercially competitive price. More recent developments such as those seen on California wind farms have dramatically changed the economic picture for wind energy. These systems, like installations in Hawaii and several European countries, have benefited from the economies of scale that come through standardised manufacturing and purchasing. The result has been a dramatic drop in capital costs: the installed cost of new wind turbines stood at $1000 per kilowatt in 1993, down from about $4000 per kilowatt in 1980, and continues to fall. Design improvements and more efficient maintenance programs for large numbers of turbines have reduced operating costs as well. The cost of electricity delivered by wind farm turbines has decreased from about 30 cents per kilowatt-hour to between 7 and 9 cents, which is generally less than the cost of electricity from conventional power stations. Reliability has also improved dramatically. The latest turbines run more than 95 per cent of the time, compared with around 60 per cent in the early 1980s. Another misconception is that improved designs are needed to make wind power feasible. Out of the numerous wind turbine designs proposed or built by inventors or developers, the propeller-blade type, which is based on detailed analytical models as well as extensive experimental data, has emerged as predominant among the more than 20,000 machines now in commercial operation world-wide. Like the gas-driven turbines that power jet aircraft, these are sophisticated pieces of rotating machinery. They are already highly efficient, and there is no reason to believe that other configurations will produce major benefits. Like other ways of generating electricity, wind power does not leave the environment entirely unharmed. There are many potential problems, ranging from interference with telecommunications to impact on wildlife and natural habitats. But these effects must be balanced against those associated with other forms of electricity generation. Conventional power stations impose hidden costs on society, such as the control of air pollution, the management of nuclear waste and global warming. As wind power has been ignored in the US over the past few years, expertise and commercial exploitation in the field have shifted to Europe. The European Union spends 10 times as much as the US government on research and development of wind energy. It estimates that at least 10 per cent of Europe’s electrical power could be supplied by land-based wind-turbines using current technology. Indeed, according to the American Wind Energy Association, an independent organisation based in Washington, Denmark, Britain, Spain and the Netherlands will each surpass the US in the generating capacity of wind turbines installed during the rest of the decade.‌1  Which one of the statements is true?‌‍‌
选项：
A:   Cost was a big factor in preventing the development of wind power
B: Wind power can provide enough electricty for the United States
C:  Some US states are powered solely by wind
D:  Wind power has developed steadily since the 1970s.
答案: 【   Cost was a big factor in preventing the development of wind power】点我阅读全文

共发射极放大电路组成与元件作用随堂测验

1、单选题：

​单管共发射极交流电压放大电路如图所示，该电路的输出电压uO与输入电压ui 的相位(            )。

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‍选项：
A: 相同
B: 相反
C:
D: 不确定
答案: 【 相反】点我阅读全文