在一定温度下的定容容器中,当下列物理量不再发生变化时,表明反应A(s)+2B(g

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问题:

在一定温度下的定容容器中,当下列物理量不再发生变化时,表明反应A(s)+2B(g)  C(g)+D(g) 已达到化学平衡状态的是

①混合气体的压强     ②混合气体的密度

③B的物质的量浓度   ④混合气体总物质的量

⑤混合气体的平均相对分子质量

v(C)与v(D)的比值  ⑦混合气体总质量

A.②③⑤⑦         B.③④⑤⑥      C.①③④⑤        D.①④⑦

考点:化学平衡的有关计算影响化学平衡的因素达到化学平衡的标志化学平衡常数
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抗生素治疗牙周病的原则,不正确的是()

A.牙周基础治疗效果不好的

B.急性感染的牙周疾病

C.用药前应清除菌斑、牙石

D.尽量使用广谱抗生素

E.尽量采用局部给药的途径

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抗战初期,国民政府在正面战场先后组织的会战有

①淞沪会战②太原会战③徐州会战④武汉会战[ ]

A.①②③④

B.①②③

C.②③④

D.①③④

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劳动合同按照劳动合同期限划分()

A、有固定期限的劳动合同

B、无固定期限的劳动合同

C、以完成一定工作任务为期限的劳动合同

D、完成总工的劳动合同

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监理单位受项目法人委托进行控规设计的监理工作不包括()。

A.协助项目法人择优选择规划设计单位

B.负责组织人员进行现场勘察

C.控制修建性控规设计的进度

D.参加城市国民经济与社会发展、自然环境、城市建设的历史与现状等情况调查,对修建性控规设计进行质量跟踪,提出评估报告

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When there is blood in the water, it is only natural that dorsal fins swirl around excitedly. Now that America’s housing market is ailing, predators have their sights on the country’s credit-card market. Analysts at Goldman Sachs reckon that credit-card losses could reach $ 99 billion if contagion spreads from subprime mortgages to other forms of consumer credit. Signs of strain are clearly visible. There are rises in both the charge-off and delinquency rates, which measure the share of balances that are uncollectable or more than 30 days late respectively. HSBC announced last month that it had taken a $1.4 billion charge in its American consumer-finance business, partly because of weakness among card borrowers.

It is too early to panic, though. Charge-offs and delinquencies are still low. According to Moody’s, a rating agency, the third-quarter delinquency rate of 3.89% was almost a full percentage point below the historical average. The deterioration in rates can be partly explained by technical factors. A change in America’s personal-bankruptcy laws in 2005 led to an abrupt fall in bankruptcy filings, which in turn account for a big chunk of credit-card losses ; the number of filings (and thus charge-off rates) would be rising again, whether or not overall conditions for borrowers were getting worse.

The industry also reports solid payment rates, which show how much of their debt consumers pay off each month. And confidence in credit-card asset-backed securities is pretty firm despite paralysis in other corners of structured finance. Dennis Moroney of Tower Group, a research firm, predicts that issuance volumes for 2007 will end up being 25% higher than last year.

Direct channels of infection between the subprime-mortgage crisis and the credit-card market certainly exist: consumers are likelier to load up on credit-card debt now that home- equity loans are drying up. But card issuers look at cash flow rather than asset values, so falling house prices do not necessarily trigger a change in borrowers’ creditworthiness. They may even work to issuers’ advantage. The incentives for consumers to keep paying the mortgage decrease if properties are worth less than the value of the loan; card debt rises higher up the list of repayment priorities as a result.

Card issuers are also able to respond much more swiftly and flexibly to stormier conditions than mortgage lenders are, by changing interest rates or altering credit limits. That should in theory reduce the risk of a rapid repricing of assets. "We are not going to wake up one day and totally revalue the loans," says Gary Perlin, Capital One’ s chief financial officer.

If a sudden subprime-style meltdown in the credit-card market is improbable, the risks of a sustained downturn are much more real. If lower house prices and a contraction in credit push America into recession, the industry will undoubtedly face a grimmer future. Keep watching for those dorsal fins.

According to the third paragraph, why would the number of bankruptcy filings be rising again ()

A. There is a change in America’s personal-bankruptcy laws

B. The charge-offs and delinquencies are still low

C. The influence of the personal-bankruptcy laws has been digested

D. The overall conditions for borrowers are getting worse

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