澳大利亚国徽(下图)上的两种动物是[ ] A.考拉、袋鼠 B.袋鼠、鸸鹋 C.

题型:选择题

问题:

澳大利亚国徽(下图)上的两种动物是[ ]

A.考拉、袋鼠

B.袋鼠、鸸鹋

C.鸭嘴兽、鸸鹋

D.河马、大象

考点:澳大利亚
题型:选择题

良恶性丙种球蛋白血症的鉴别诊断应首选()

A.Ig含量测定

B.骨髓涂片检测

C.血清蛋白区带电泳

D.对流电泳

E.火箭免疫电泳

题型:选择题

鉴别吉兰-巴雷综合征和脊髓灰质炎,最重要的体征为

A.肌张力减低

B.肌肉萎缩

C.腱反射消失

D.病理征阴性

E.感觉异常

题型:选择题

成年男性体液总量约占体重的()

A.45%

B.50%

C.55%

D.60%

E.65%

题型:选择题

SAP中账户类型包含以下哪些:()。

A.总分类账

B.客户

C.供应商

D.固定资产

E.物料

题型: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’ o0 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.

What does unwanted e-mail messages do to the providers of the Internet services

A.Raising their cost.

B.Raising the Internet speed.

C.Improving their business.

D.Attracting investment.

更多题库