当线路平纵断面不改变、货流和车流结构一定时，货物列车牵引重量主要受制于机车类型和（）

正常人血清中可有一定量的伤寒杆菌抗体，但一般范围在

A．"0"抗体＜1：40，"H"抗体＜1：80

B．"O"抗体＜1：80，"H"抗体＜1：80

C．"O"抗体＜1：80，"H"抗体＜1：40

D．"O"抗体＜1：80，"H"抗体＜1：160

E．"O"抗体＜1：40，"H"抗体＜1：40

患者男，89岁，因“间断咳嗽、咳痰、气喘30年，加重伴发热5d”来诊。患慢性喘息性支气管炎、肺气肿30年，曾多次因咳嗽、咳痰、气喘加重及发热住院。5d前再次发作。查体：T39.4℃，P102次/min，R24次/min，BP160/70mmHg；咽部无充血，双肺满布高调哮鸣音，双下肺未闻及湿性啰音，心界不大，律齐，各瓣膜区无杂音；双下肢无水肿。血常规：WBC16.7×10/L，N0.94；血气分析：pH7.375，PaO74mmHg，PaCO48mmHg，SaO94％；肝、肾功能正常。胸部X线片：双下肺纹理增多，主动脉硬化。初步诊断：慢性喘息性支气管炎急性发作；肺气肿。予吸氧、拍背、雾化吸入，静脉滴注头孢呋辛0.5g，12h1次；静脉滴注氨茶碱注射液0.5g，每日1次；静脉滴注甲泼尼龙注射液80mg，8h1次；静脉推注盐酸氨溴索注射液，每日2次。4d后患者体温恢复正常，咳嗽、咳痰症状减轻，但气喘持续不能缓解；双肺仍满布哮鸣音。3d后患者再次出现发热，体温达38.2℃；胸部CT：右下肺感染。静脉滴注他唑巴坦钠/哌拉西林钠4.5g，8h1次；静脉滴注洛美沙星0.2g，12h1次，静脉滴注甲泼尼龙注射液，剂量调整为120mg，8h1次，同时辅予强心（毛花苷C）、利尿（呋塞米）治疗。2d后体温正常，咳嗽、咳痰、气喘症状均缓解，甲泼尼龙减量1次，停用抗生素。复查胸部CT：右肺上、下叶及左肺下叶多发团片状密度增高影，大小不一，以右下肺明显，大者3.9cm×4.4cm，右上肺病灶内可见小弧形透亮影。

进一步明确诊断，还需要进行的检查是（）

A.纤维支气管镜检查

B.痰培养

C.痰细胞学检查

D.PPD试验

E.肺组织活检

F.胸部MRI

产后发热的治疗原则主要是

A．调气血，和营卫

B．清热解毒退热

C．活血化瘀清热

D．养血清热

E．疏风清热

While the ripples of America’s subprime-mortgage crisis have spread far and wide, Latin America—a place long associated with financial disaster—has remained improbably calm. Banks have reported no unpleasant surprises. Brazil and Peru have been blessed with coveted investment-grade ratings. Surprisingly, perhaps the fleetest country of all has been Argentina. Since it emerged from the financial crisis of 2001-02, it has been one of the world’s fastest-growing economies. It is expected to expand faster than most of its neighbors again this year.

Quite simply, it barely has any credit. Back when its economy virtually collapsed, the country suffered a run on its banks, followed by a freeze on withdrawals, and a massive currency devaluation. As a result, bank lending to the private sector shrivelled, from 23.8% of GDP in 2000 to 10.8% in 2003. Since then, it has rebounded to a piddling 13% ; by contrast, the ratio in Brazil was 36.5% in 2006. Almost all of these loans in Argentina are accessible only on a short-term basis.

Once its recovery began in June 2002, Argentina became a paradise for business. Unemployment of over 20% kept wages down, and the devaluation gave exporters an edge on foreign competitors. The ample productive capacity left idle by the crisis meant firms could expand without making big investments. And the windfall profits reaped by agricultural exporters, thanks to record commodities prices, enabled many of them to finance new projects out of earnings. Hence the economy could grow at almost 9% a year with little need for credit.

But such a lucky confluence of factors could not last. Starting in early 2005 ,.inflation picked up, a sign that the installed capacity was starting to limit output. Salaries and prices for raw materials increased sharply, cutting into profits. And farmers were particularly hard hit when the government nearly doubled the taxes in farm exports. Now, just as companies need to embark on big investments if they are to keep growing, their margins are no longer big enough to pay for the expansion and they need to borrow.

So, the time is ripe for the country’s financial system to recover. But a number of things are in the way. Foremost is Argentina’s business risk. Those in the informal economy (which represents over 40% of GDP) can neither save nor borrow legally, lest they become known to the taxmen. The rest remain cowed by memories of the crisis. Although Argentines have poured their savings into property, fuelling a construction boom, they still hold about four-fifths of their deposits abroad.

Inflation, fuelled by a public-spending binge, state-mandated wage increases, and a cheap currency, is not helping either. No one knows how high it is. The consumer-price index is doctored to keep the official rate below 10%, but private estimates suggest it is near 25%. Without a reliable index of inflation, lending is almost impossible, even for the medium term. And the central bank has kept interest rates ply negative in real terms, encouraging workers to spend their wages rather than to save.

There is no reliable index of inflation, because（）

A. the currency is cheap

B. there are different ways to get the index

C. the index have been manipulated by the government

D. the central bank has kept rates low

操作系统主要的性能参数有 (48) 、 (49) 和 (50) 等。 (48) 指的是单位时间内系统处理的作业量。 (49) 指的是从作业或命令的输入到其结束的间隔时间，在分析性能时常用其倒数。 (50) 指的是在一个给定时间内，系统的一个指定成分被使用的时间比例。
操作系统的保护主要包括存储保护、程序保护和文件与数据保护等。采用存取权限控制方法时，任一需保护的客体，都对应于一个二元组( (51) ， (52) )，其中 (51) 表示用户、进程或用户组、进程组。

A．允许动作

B．客体

C．执行

D．主体