在魏晋南北朝时期,鲜卑族原本是()的生活方式。A、农耕B、打猎C、打渔D、游牧

题型:单项选择题

问题:

在魏晋南北朝时期,鲜卑族原本是()的生活方式。

A、农耕

B、打猎

C、打渔

D、游牧

考点:历史学简明中国古代史简明中国古代史题库
题型:单项选择题

遗传性球形细胞增多症的临床表现不包括()

A.出血

B.贫血和黄疸

C.感染

D.脾大

E.急性左心衰

题型:单项选择题

国家行政的客体是

A.国家政务

B.家庭事务

C.社会事务

D.单位事务

E.企业事务

题型:单项选择题

测试的正确定义是______。

题型: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 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:单项选择题

下列急性附睾炎的临床特点,不正确的是()

A.常由泌尿系感染和前列腺炎、精囊炎扩散所致

B.畏寒、高热,阴囊明显肿胀、疼痛,可伴膀胱刺激症状

C.缺血、坏死发生率较高

D.可形成脓肿,可继发附睾睾丸炎、睾丸鞘膜积液

E.需与附睾结核、睾丸扭转鉴别

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