按励磁功率源,励磁系统可分为:()励磁系统、()励磁系统、静止励磁系统。
参考答案:直流;交流
The fact that most Americans live in urban areas does not mean that they reside in the center of large cities. In fact, more Americans live in the suburbs of large metropolitan areas than in the cities themselves.The Bureau of the Census regards any area with more than 2,500 people as an urban area, and does not consider boundaries of cities and suburbs.According to the Bureau, the political boundaries are less significant than the social and economic relationships and the transportation and communication systems that integrate a locale. The term used by the Bureau for an integrated metropolis is an MSA, which stands for Metropolitan Statistical Area. In general, an MSA is any area that contains a city and its surrounding suburbs and has a total population of 50,000 or more.At the present time, the Bureau reports more than 280 MSAs, which together account for 75 percent of the US population. In addition, the Bureau recognizes 18 megapolises, that is, continuous adjacent metropolitan areas. One of the most obvious megapolises includes a chain of hundreds of cities and suburbs across 10 states on the East Coast from Massachusetts to Virginia, including Boston, New York, and Washington, D.C. In the Eastern Corridor, as it is called, a population of 45 million inhabitants is concentrated. Another megapolis that is growing rapidly is the California coast from San Francisco through Los Angeles to San Diego.
The underlined word "integrate" in Paragraph 3 is closest in meaning to ______.
A.benefit
B.define
C.unite
D.restrict
2017年9月1日,十二届全国人大常委会第二十九次会议闭幕。会议经表决,通过了核安全法、新修订的中小企业促进法、国歌法、关于修改法官法等八部法律的决定。全国人大常委会法工委国家法室主任武增表示,国歌法以()的形式,落实了宪法规定的国家标志制度,明确了应当和不得奏唱国歌的场合、奏唱国歌时的礼仪;为保证国歌的奏唱效果,规定国家要组织审定国歌标准演奏曲谱、录制官方录音版本;明确了对侮辱国歌行为的处罚。
A.宪法
B.国家立法
C.全国人大会议表决
D.法律