设m、n是平面α外的两条直线,给出列下命题:①m⊥α,m⊥n,则n∥α;②m⊥n

题型:填空题

问题:

设m、n是平面α外的两条直线,给出列下命题:①m⊥α,m⊥n,则nα;②m⊥n,nα,则m⊥α;③m⊥α,nα,则m⊥n;④mα,nα,则mn.请将正确命题的序号填在横线上______.

考点:空间中直线与直线的位置关系空间中直线与平面的位置关系
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女性患者,76岁,以“意识不清1小时”为主诉来急诊入院,头颅CT显示右侧基底核区肾形高密度影。诊断考虑为()

A.晕厥

B.脑出血

C.脑栓塞

D.脑梗死

E.TIA

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女,16岁,有性生活史,因停经35天,根据U超检查声像图如下,合理的超声诊断意见为()

A.动态观察

B.早孕

C.宫外孕可能,建议经 * * 超声检查

D.抗感染治疗

E.内膜过度增生

题型:填空题

纸币流通条件下的特有现象是通货膨胀与( )相联。

A.物价上涨

B.纸币流通

C.购买力降低

D.财政赤字

题型:填空题

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 mall 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 mall 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 mall.

Many senders of unsolicited commercial electronic mall 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 mall 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 mall cannot be solved by the government alone. The development and adoption of techno-logical approaches and the pursuit of cooperative efforts with other countries will be necessary as well.

Unwanted e-mail may ().

A. cause companies to fail in business

B. cause wanted e-mail messages to lose

C. damage the credit of a company

D. do good to a small company

题型:填空题

电动机()是指电机绕组温度和环境温度的差值。

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