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问题 单项选择题

真空中两个点电荷之间的作用力（）。

A.跟它们的电量乘积成正比，与它们之间的距离成正比

B.跟它们的电量之和成正比，与它们之间的距离成反比

C.跟它们的电量乘积成反比，与它们之间的距离成正比

D.跟它们的电量乘积成正比，与它们之间的距离成反比

答案

参考答案：D

单项选择题

Electronic mail has become an extremely important and popular means of communication.
The convenience and efficiency of electronic mail are threatened by the extremely rapid growth in the volume of unsolicited commercial electronic mail. Unsolicited commercial electronic mail is currently estimated to account for over half of all electronic mail traffic, up from an estimated 7 percent in 2001, and the volume continues to rise. Most of these messages are fraudulent or deceptive in one or more respects.
The receipt of unsolicited commercial electronic mail may result in costs to recipients who cannot refuse to accept such mail and who incur costs for the storage of such mail, or for the time spent accessing, reviewing, and discarding such mail, or for both. The receipt of a large number of unwanted messages also decreases the convenience of electronic mail and creates a risk that wanted electronic mail messages, both commercial and noncommercial, will be lost, overlooked, or discarded amidst the larger volume of unwanted messages, thus reducing the reliability and usefulness of electronic mail to the recipient. Some commercial electronic mail contains material that many recipients may consider vulgar or pornographic in nature.
The growth in unsolicited commercial electronic mail imposes significant monetary costs on providers of Internet access services, businesses, and educational and nonprofit institutions that carry and receive such mail, as there is a finite volume of mail that such providers, businesses, and institutions can handle without further investment in infrastructure. Many senders of unsolicited commercial electronic mail purposefully disguise the source of such mail.
Many senders of unsolicited commercial electronic mail purposefully include misleading information in the messages’ subject lines in order to induce the recipients to view the messages. While some senders of commercial electronic mail messages provide simple and reliable ways for recipients to reject (or "opt-out" of) receipt of commercial electronic mail from such senders in the future, other senders provide no such "opt-out" mechanism, or refuse to honor the requests of recipients not to receive electronic mail from such senders in the future, or both.
Many senders of bulk unsolicited commercial electronic mail use computer programs to gather large numbers of electronic mail addresses on an automated basis from Internet websites or online services where users must post their addresses in order to make full use of the website or service.
The problems associated with the rapid growth and abuse of unsolicited commercial electronic mail cannot be solved by the government alone. The development and adoption of technological approaches and the pursuit of cooperative efforts with other countries will be necessary as well.

According to the passage, efficiency of e-mail is threatened by ______.

A. heavy e-mail traffic
B. fraudulent e-mail messages
C. large volume of messages
D. increasing amount of unwanted e-mail
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单项选择题 案例分析题

2008年2月3日甲乙之间签订合同约定，乙借给甲10万元，甲以自己的一辆汽车作为借贷的抵押担保。2月5日，乙将10万元交给甲，但甲并没有将汽车交给乙，也没有办理登记手续。2月10日甲与丙订立合同，约定甲向丙购买一批价值30万元的冰箱，违约金3万元，同时，甲向丙交付了1.5万元的定金。之后丙又要求甲为该合同提供担保，于是二人于2月15日订立了质押合同，约定甲将自己的汽车质押给丙，2月16日，甲将汽车交给了丙。后来丙由于无法提供合同约定的冰箱而违约，导致甲损失2万元。在丙占有该汽车期间，丙又将其出质给了不知情的丁。丁由于驾驶不当而造成汽车多处受损，遂到戊的汽车修理店维修，丁修完后交了修理费要将车开走，戊以丁之前还欠其5000元为由要求留置该汽车。

戊能否留置丁送来修理的汽车（）

A、能

B、不能
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