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【单选题】
When the Federal Communications Commission proposed giving low-power radio stations licenses on the FM dial, they knew they'd get flak from big broadcasting. The National Association of Broadcasters (NAB), after all, spends millions of dollars every year lobbying to keep everybody else off the radio spectrum—even locally managed, noncommercial stations that broadcast only within a four-mile radius. Sure enough, when the FCC proposed its new regulations, the NAB began screaming about all the terrible things those tiny radio transmitters could do to the big ones, whose signals are 500 times as strong and whose reach is nearly 20 times as far. It was a pretty thin argument. So thin, in fact, that for a while if appeared the proposed regulations might survive the lobbying onslaught. And then the FCC and its allies ran into a most unlikely opponent, one with the moral authority to do real damage to their cause: National Public Radio. One might easily assume that NPR would look out for the public interest. After all, NPR was born from the Public Broadcasting Act of 1967, which called for it to 'encourage the development of programming that involves creative risks and that addresses the needs of unserved and underserved audiences' while creating 'programs of high quality, diversity, creativity, excellence, and innovation which are obtained from diverse sources.' The charter, in other words, describes exactly the kind of programming low-power radio might provide, particularly in rural or heavily immigrant communities where locally oriented programming could be more useful than nationally syndicated shows. But the well-meaning lefties at NPR didn't see low-power radio as a potential ally or kindred spirit. They saw it just as the big broadcasters did—as a threat—and tried to squash it in much the same way. They may have succeeded. NPR's lobbying supported a last-minute rider in December's Senate appropriations bill (which eventually became law). This amendment severely handicaps the low-power radio initiative. Specifically, it limits the licensing of low-power radio to just nine test markets, enforcing restrictions that effectively keep it out of urban are as and other major markets. It also mandates testing to determine the economic impact on established broadcasters. And, though John McCain has vowed to continue the fight for low power, for now at least NPR has won the day. The primary motivation behind opening the airwaves to low-power radio was to undo the damage wrought by the Telecommunications Act of 1996. That law was supposed to increase competition on the airwaves. Instead, it consolidated control of radio stations in the hands of a few large, national companies that syndicate programs (or even whole broadcasts) to their affiliates, thus squeezing out local programming. By allowing small, noncommercial stations, to break into the spectrum, the FCC hoped to reintroduce local material in places where it has all but vanished. In its application process, the FCC privileged local content and community involvement—for example, assigning spectrum space to stations in primarily Latino areas that broadcast family-planning information in Spanish. Part of the application asked aspiring broadcasters how their stations would serve their neighborhoods. From the text we can infer that the NAB represents______.
A.
backers of commercial radio
B.
National Public Radio
C.
large radio stations in the U.S.
D.
companies which produce large radio transmitters
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【判断题】在判断分立元件反馈放大电路的反馈极性时,净输入电压常指输入级晶体管的b-e(e-b)间或场效应管g-s(s-g)间的电位差。
A.
正确
B.
错误
【单选题】禁止用人单位安排女职工在经期从事高处、低温、冷水作业和国家规定的( )体力劳动强度的劳动。
A.
第一级
B.
第二级
C.
第三级
D.
第四级
【多选题】女职工属于弱势群体,关于女工保护的说法,以下选项中理解正确的有( )。
A.
禁止用人单位安排女工从事矿山井下、国家规定的第四级体力劳动强度和劳动和其他类似从而禁忌从事的劳动,用人单位应严格遵守
B.
禁止用人单位使用未成年工,而且用人单位应当对未成年工定期进行各种健康检查
C.
禁止用人单位安排女职工在经期从事高处,低温、冷水作业和国家规定第三级体力劳动
D.
禁止用人单位安排女职工在怀孕期间从事国家规定的第三级体力劳动强度的劳动和孕期禁忌从事的活动,对怀孕7个月以上的职工,不得安排其延长工作时间和夜班劳动
E.
禁止用人单位安排女职工在哺乳未满、周岁婴儿期间从事国家规定的第三级体力劳动强度和哺乳期禁忌从事的其他活动,并且也不得延长她们的工作时间和夜班劳动
【判断题】几个电阻并联后的总电阻一定小于其中任一个电阻的阻值。
A.
正确
B.
错误
【多选题】对女工的保护规定主要有( )。
A.
禁止女工从事国家规定的三级体力劳动强度的劳动
B.
对怀孕5个月的职工,不得安排其夜班劳动
C.
禁止用人单位安排女职工在怀孕期间从事国家规定的第四级体力劳动强度的劳动
D.
禁止用人单位安排女职工在经期从事高处、低温作业
E.
禁止用人单位安排女职工在哺乳未满一周岁的婴儿期间从事国家规定的第三级体力劳动
【判断题】电阻并联 后的总电阻小于其中任一个电阻的阻值。
A.
正确
B.
错误
【判断题】在判断分立元件反馈放大电路的反馈极性时,净输入电压常指输入级晶体管的 b-e ( e-b )间或场效应管 g-s ( s-g )间的电位差。
A.
正确
B.
错误
【判断题】几个电阻并联后的总电阻值一定小于其中任一只电阻的阻值。
A.
正确
B.
错误
【单选题】维生素 D 的叙述下列哪项是错误的
A.
麦角固醇可转变成D2
B.
7-脱氢胆固醇可转变成D3
C.
都是类固醇的衍生物
D.
维生素D3的活性形式是24、25-(OH)-D3
E.
必须在肝和肾进行羟化
【简答题】(2)在判断分立元件反馈放大电路的反馈极性时,净输入电流常指输入级晶体管的基极电流(射极电流)或场效应管的栅极(源极)电流
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