人造骨是一种新型的无机非金属材料,它类似于人骨和天然牙的性质结构,这是利用了这类

题型:填空题

问题:

人造骨是一种新型的无机非金属材料,它类似于人骨和天然牙的性质结构,这是利用了这类材料的________特性。人造骨可以依靠从人体体液中补充某些离子而形成新骨,可在骨骼界面产生分解、吸收、析出等反应,实现骨骼的牢固结合.人造骨植入人体内需要吸收人体中________形成新骨。

A.Ca2

B.Cl

C.Na

D.PO43

考点:碳单质及化合物单质硅硅酸盐硅酸(原硅酸)
题型:填空题

转子流量计中转子悬浮的高度是()。

A.设计定的与转子大小有关

B.设计定义转子高矮有关系

C.流量大小的量度

D.没有什么直接关系

题型:填空题

对泌尿系阳性结石,应首选何种检查为宜?()

A.腹部平片

B.CT

C.腹膜后充气造影

D.逆行肾盂造影

E.静脉肾盂造影

题型:填空题

商业银行同业拆借市场的特点有______。

A.期限短
B.金额大
C.金额小
D.风险低

题型:填空题

下列可应用杠杆原理获得省力效果的拔伸法是()

A.腰椎瞬间拔伸法

B.腰椎缓力拔伸法

C.坐位颈椎拔伸法

D.仰卧位颈椎拔伸法

题型:填空题

Democrats on the Senate Judiciary Committee vented their fury over high gasoline prices at executives of the nation’s five largest oil companies on Wednesday, grilling the oilmen over their multimillion-dollar pay packages and warning them that Congress was intent on taking action that could include a new tax on so-called windfall profits. Such showdowns between lawmakers and oil titans have become a familiar routine on Capitol Hill. But with gas prices nearing $ 4 a gallon, and lawmakers headed home for a weeklong Memorial Day recess where they expect to get an earful from angry constituents, there is added urgency for Congress to appear active.

But while momentum is building for several measures, including a bill that would allow the Organization of the Petroleum Exporting Countries to be sued in American courts under antitrust laws, there is little sign that any of the proposals would do much, if anything, to lower prices quickly. And the oil executives warned that government intervention might only make things worse. Instead, they called on Congress to allow more drilling and exploration for domestic oil.

The increasing urgency to seem aggressive about gasoline prices was apparent on Tuesday when the House voted by an overwhelming 324 to 84 to approve the bill, commonly referred to as NOPEC, which classifies OPEC as a monopoly in violation of the Sherman Antitrust Act. Senate Democrats have included that measure as part of a package of legislation intended to address the high price of gasoline, along with the tax on windfall profits and a measure to tamp down speculation in the oil futures market that many lawmakers think is contributing to the run-up in prices.

At the Judiciary Committee hearing, Democratic senators struggled to have the executives explain how oil prices had risen so high. The senators expressed doubt that basic laws of supply and demand were at work and suggested instead a more sinister combination of monopolistic behavior by oil-producing countries, speculation in the futures markets and sheer corporate greed.

On Monday, President Bush signed a bill temporarily suspending the purchase of crude oil for the nation’s Strategic Petroleum Reserve. Mr. Bush had initially opposed such action but relented after the House and Senate approved the bill by wide margins. Senator Richard J. Durbin, Democrat of Illinois and a p supporter of Senator Baraek Obama’s presidential bid, made a particularly pointed attack, in which he seemed to warn the oil executives that they would soon no longer have such a good friend in the White House. He also suggested that Mr. Bush should be doing more to press the oil companies to help lower prices at the pump, while acknowledging that it would be difficult to pass a windfall profits tax while Mr. Bush was still in office.

Senate Democrats were angry with the oilmen because()

A. they get tax-free pay packages

B. Congress took on actions but in vain

C. the showdowns were merely a routine

D. oil prices had risen so high

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