问答题简答题：多层次、重叠式立体网络规划的主要特点是什么？什么是横向切换？什么是纵向切换？

题型：解答题

在平面直角坐标系xOy中，已知点A(0，-1)，B点在直线y=-3上，M点满足MB∥OA，MA·AB=MB·BA，M点的轨迹为曲线C。

（Ⅰ）求C的方程；

（Ⅱ）P为C上的动点，l为C在P点处得切线，求O点到l距离的最小值。

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题型：单项选择题

省、自治区、直辖市的人民代表大会及其常务委员会以及较大的市的人民代表大会及其常务委员会，根据本行政区域的具体情况和实际需要，根据《城市规划法》相继制定了地方性的规划条例或者实施细则、实施办法。其中较大的市不是指（）。

A.人口超过200万的市

B.省、自治区的人民政府所在地的市

C.经济特区所在地的市

D.经国务院批准的较大的市

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题型：单项选择题

Passage Two

In 1998 consumers could purchase virtually anything over the Internet. Books, compact discs, and even stocks were available from World Wide Web sites that seemed to spring up almost daily. A few years earlier, some people had predicted that consumers accustomed to shopping in stores would be reluctant to buy things that they could not see or touch in person. For a growing number of time-starved consumers, however, shopping from their home computer was proving to be a convenient alternative to driving to the store.
A research estimated that in 1998 U.S. consumers would purchase ＄ 7.3 billion of goods over the Internet, double the 1997 total. Finding a bargain was getting easier, owing to the rise of online auctions and Web sites that did comparison shopping on the Internet for the best deal.
For all the consumer interest, retailing in cyberspace was still a largely unprofitable business, however. Internet pioneer Amazon. com, which began selling books in 1995 and later branched into recorded music and videos, posted revenue of $153.7 million in the third quarter, up from ＄ 37.9 million in the same period of 1997．Overall, however, the company’s loss widened to ＄ 45.2 million from $ 9.6 million, and analysts did not expect the company to turn a profit until 2003．Despite the great loss, Amazon com had a stock market value of many billions, reflecting investors’ optimism about the future of the industry.
Internet retailing appealed to investors because it provided an efficient means for reaching millions of consumers without having the cost of operating conventional stores with their armies of salespeople. Selling online carried its own risks, however. With so many companies competing for consumers’ attention, price competition was intense and profit margins thin or nonexistent. One video retailer sold the hit movie Titanic for ＄ 9.99, undercutting (削价) the ＄19.99 suggested retail price and losing about ＄ 6 on each copy sold．With Internet retailing still in its initial stage, companies seemed willing to absorb such losses in an attempt to establish a dominant market position.

"For all the consumer interest" (Para.3) means______.

A．to the interest of all the consumers

B．for the interest of all the consumers

C．all the consumers are much interested

D．though consumers are very much interested

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题型：名词解释

甩球

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题型：单项选择题

以下哪项不是工作负责人（监护人）的责任：（）。

A、正确安全地组织工作；

B、工作班成员精神状态是否良好；

C、工作班成员变动是否合适；

D、工作必要性和安全性。

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多层次、重叠式立体网络规划的主要特点是什么？什么是横向切换？什么是纵向切换？

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