当交流电源电压加到变压器的一次绕组后，在变压器铁芯中将产生（）磁通。

发布时间：2017-07-04 22:47 │ 来源：www.tikuol.com

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问题：

当交流电源电压加到变压器的一次绕组后，在变压器铁芯中将产生（）磁通。

考点：电工进网证考试电工进网证（高压类）电工进网证（高压类）题库

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青少年体内哪项生理活动会促使身体不断长高[ ]

A．骨密质不断增厚

B．长骨端与骨干之间的软骨层不断产生的骨组织

C．骨松质排列更加整齐

D．骨膜内成骨细胞不断产生的新的骨组织

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A total of 4.6 million digital televisions have been sold, and the sales of HDTV sets have quadrupled since last year. Consumers have bought HDTVs to play their DVDs and to have clearer pictures and wide screens. Only a small percentage of the people who have purchased HDTVs, however, have actually hooked their TVs up to receive high-definition television digital signals. Perhaps television viewers are having trouble keeping up with the changes in technology. Even the manufacturers of HDTVs, like Mitsubishi, Thomson Multimedia, Sony, and Samsung seem to have a tough time learning how to make their sets work with the various digital TV formats because little standardization has been required or implemented in the industry.
Some of the HDTVs Weigh over 200 lbs., and a variety of retailers offer a delivery service to the buyer’s home to help install the heavy sets. This is known as a white-glove service and usually comes with an extra fee. After HDTV purchasers get their sets home and hook them up, they will still need to Work to get the digital signals to their systems. Most of the industry’s cable providers do not yet offer high-definition programing, and only about 15% of commercial television stations have switched over to even the lowest improved digital pictures. Worse yet, viewers may need to install antenna before they can even get the digital signals to their new HDTV sets. Another frustration for home-theater seekers is that the current HDTV sets allow owners only to watch high-definition programs, not to record them.

According to the passage, which of the following offers most of the HDTV programmes so far

A．Retailer delivery services.

B．Cable providers.

C．Commercial television stations.

D．HDTV set manufacturers.

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波形梁护栏板的镀锌量一般要求得大于（）克/平方米。

A、425

B、500

C、600

D、650

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投资的税收抵免类似于政府对私人投资的一种补助，因而可以称之为（）。

A.投资回报

B.投资津贴

C.投资红利

D.投资陷阱

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下列关于垄断协议的豁免情形的说法正确的是哪些( )

A．为改进技术、研究开发新产品的，经营者还应证明所达成的协议不会严重限制相关市场的竞争，并且能够使消费者分享由此产生的利益

B．为提高产品质量、降低成本、增进效率，统一产品规格、标准或者实行专业化分工的，且经营者还应证明所达成的协议不会严重限制相关市场的竞争，并且能够使消费者分享由此产生的利益

C．为提高中小经营者经营效率，增强中小经营者竞争力的，经营者还应证明所达成的协议不会严重限制相关市场的竞争，并且能够使消费者分享由此产生的利益

D．为保障对外贸易和对外经济合作中的正当利益的，且经营者还应证明所达成的协议不会严重限制相关市场的竞争，并且能够使消费者分享由此产生的利益

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