我国目前对对外贸易经营者的管理实行: A.自由进出制 B.登记和核准制 C.审批

题型:单项选择题

问题:

我国目前对对外贸易经营者的管理实行:

A.自由进出制
B.登记和核准制
C.审批制
D.备案登记制

考点:海关报关员考试报关与对外贸易管制报关员
题型:单项选择题

下列叙述中,正确的是                                             (   )

A.在船舶的外壳装上铜块可防止其发生电化学腐蚀

B.MnO2、FeCl3和CuSO4都可加快H2O2的分解速率

C.FeCl3溶液和Fe2(SO4)3溶液加热蒸干、灼烧都得到Fe2O3

D.用惰性电极分别电解CuCl2溶液和MgCl2溶液分别得到单质Cu和Mg

题型:单项选择题

预防无菌切口感染的主要措施为()

A.皮下止血不能用电烙

B.血管结扎要用细丝线

C.严格遵守无菌技术

D.手术完毕时用等渗盐水冲洗切口

E.切口内安放引流

题型:单项选择题

Celebrate. Celebrate. Physicians are delighted with a Food and Drug Administration (FDA) advisory panel’s recommendation earlier this year that Vioxx and its cousins Bextra and Celebrex (all medicines known as Cox-2 inhibitors) should remain on the market, despite evidence they increase heart disease risk in some people. The panelists reached their decision after weighing all the data and concluding the benefits of these pain-relieving drugs outweighed the risks.
Specifically, these scientists acknowledged that, for some patients, these prescription drugs were uniquely effective in reducing pain from arthritis and other causes. For others—concerned about ulcers associated with aspirin and other OTC analgesics—the Cox-2 inhibitors offered the advantage of minimizing potentially serious effects of stomach irritation.
Now is an appropriate time for everyone to take a fresh look at the benefit-risk equation for Vioxx and the other Cox-2 inhibitors.
The risks-increased risk of heart disease in some who use the drugs—have been well publicized. Much less publicity has been given to a spectrum of real and potential benefits that go way beyond reduced risk of stomach irritation. These little-discussed benefits would have been lost, perhaps permanently-had Vioxx, Bextra and Celebrex been driven from shelves in pursuit of perfect safety, an unattainable goal.
For example, there is substantial evidence Cox-2 inhibitors can reduce development of colon polyps, which may become colon canceL Indeed. Celebrex is FDA-approved for those genetically prone to colon cancer. Ironically, the 2004 study that revealed the elevated heart attack risk of Vioxx was primarily designed to further establish the drug’s effectiveness in protecting against colon cancer. And while the results of that interrupted trial have not yet been published, there is good reason to believe they will confirm the protective effects against colon cancer established in research over the last 10 years.
At the time of its withdrawal from the market last fall, studies of Vioxx as well as the other Cox-2 drugs suggest that they had other anti-cancer properties as well, possibly reducing the risk of malignancies of a number of sites, including the lung and esophagus.
Had these drugs been dismissed, their untapped promise for prevention would have evaporated well before it was evaluated and applied to save lives. Fortunately, cooler and wiser heads prevailed.

The primary purpose of the 2004 study about Vioxx was to ______.

A.confirm its power in cancer-prevention

B.see if it protects against cancer for sure

C.reveal its potential risks in causing heart attack

D.interrupt the research focusing on its drawbacks

题型:单项选择题

简述可调阻尼力减振器的组成及工作原理?

题型:单项选择题

以下操作系统需要另装虚拟拨号软件的是()

A.WIN2000

B.WINXP

C.WIN2003

D.VISTA

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