下列膜分子中,哪种与B淋巴细胞摄取抗原有关() A.FcR B.mIg C.MHCⅠ

题型:单项选择题 A1型题

问题:

下列膜分子中,哪种与B淋巴细胞摄取抗原有关()

A.FcR

B.mIg

C.MHCⅠ类分子

D.黏附分子

E.以上均不是

考点:公卫执业医师公卫执业医师模拟试题(二)第一单元
题型:单项选择题 A1型题

质量为m的物体沿着半径为r的半球形金属球壳滑到最低点时的速度大小为υ,如图所示,若物体与球壳之间的摩擦因数为μ,则物体在最低点时的 

[ ]

A.向心加速度为     

B.向心力为m(g+)

C.对球壳的压力为  

D.受到的摩擦力为μm(g+)

题型:单项选择题 A1型题

癫证痰气郁结证主方

A.二阴煎
B.顺气导痰汤
C.生铁落饮
D.镇肝熄风汤
E.养心汤

题型:单项选择题 A1型题

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.

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 A1型题

丁某认为市政府为邻居胡某颁发的《集体上地建设用地使用证》,与自己的宅基地使用面积有部分重合,侵犯了自己的合法权益,丁某向省政府申请行政复议,但省政府在法定期限内没有作出复议决定,则下列说法正确的是哪些

A.丁某可以针对市政府的颁证行为,向人民法院提起行政诉讼

B.丁某可以针对省政府未按期作出复议决定,向人民法院提起行政诉讼

C.丁某可以针对省政府未按期作出复议决定,向国务院申请裁决

D.丁某可以对省政府不按期作出复议决定的行为,向省政府再次申请复议

题型:单项选择题 A1型题

住房公积金定向用于职工住房,通过安全运作实现合理增值。公积金的增值收益用于提取贷款风险准备金和中心的管理费用。 ( )

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