8度区内某高层剪力墙结构，主体高度为75m，裙房高12m，主体结构与裙房交接处设置防

小明在他的铝制饭盒上刻上名字。方法如下：在除去油污的饭盒表面用稀盐酸清洗（目的是除去饭盒表面的氧化膜），然后蘸取蚀刻液（CuSO₄、FeCl₃的混合液）涂抹在需要蚀刻的部位，涂液处出现红色时，用水清洗，反复几次，即可刻上名字。

（1）除去氧化膜的反应化学方程式是：_________________________。

（2）写出蚀刻时发生的化学方程式：________________________、_________________________、Fe+CuSO₄==FeSO₄+Cu。

用手工TIG焊焊接铝、镁及其合金时，采用（）最佳。

A、直流正极性

B、直流反极性

C、交流电源

When it comes to suing doctors, Philadelphia is hardly the city of brotherly love. A combination of sprightly lawyers and sympathetic juries has made Philadelphia a hotspot for medical-malpractice lawsuits. Since 1995, Pennsylvania state courts have awarded an average of $ 2m in such cases, according to Jury Verdict Research, a survey firm. Some medical specialists have seen their malpractice insurance premiums nearly double over the past year. Obstetricians are now paying up to $104,000 a year to protect themselves.

The insurance industry is largely to blame. Carol Golin, the Monitor’s editor, argues that in the 1990s insurers tried to grab market share by offering artificially low rates (betting that any losses would be covered by gains on their investments). The stock-market correction, coupled with the large legal awards, has eroded the insurers’ reserves. Three in Pennsylvania alone have gone bust.

A few doctors--particularly older ones--will quit. The rest are adapting. Some are abandoning litigation-prone procedures, such as delivering babies. Others are moving parts of their practice to neighboring states where insurance rates are lower. Some from Pennsylvania have opened offices in New Jersey. New doctors may also be deterred from setting up shop in litigation havens, however prestigious.

Despite a Republican president, tort reform has got nowhere at the federal level. Indeed doctors could get clobbered indirectly by a Patients’ Bill of Rights, which would further expose managed care companies to lawsuits. This prospect has fuelled interest among doctors in Pennsylvania’s new medical malpractice reform bill, which was signed into law on March 20th. It will, among other things, give doctors $ 40m of state funds to offset their insurance premiums, spread the payment of awards out over time and prohibit individuals from double dipping--that is, suing a doctor for damages that have already been paid by their health insurer.

But will it really help Randall Bovbjerg, a health policy expert at the Urban Institute, argues that the only proper way to slow down the litigation machine would be to limit the compensation for pain and suffering, so-called "non-monetary damages". Needless to say, a fixed cap on such awards is resisted by most trial lawyers. But Mr Bovbjerg reckons a more nuanced approach, with a sliding scale of payments based on well-defined measures of injury, is a better way forward. In the meantime, doctors and insurers are bracing themselves for a couple more rough years before the insurance cycle turns.

Nobody disputes that hospital staff make mistakes: a 1999 Institute of Medicine report claimed that errors kill at least 44,000 patients a year. But there is little evidence that malpractice lawsuits on their own will solve the problem.

It seems that the author is most critical of（）

A. negligent doctors

B. unfriendly patients

C. insurance companies

D. sympathetic lawyers

在到期日一次还本付息的债券，由于有利息收入，因此不能称为“零息债券”。（）

下列那类商品不能进入商品交易所交易（）。

A.大量需求与大量供给的商品

B.耐久性商品

C.具有垄断性质的商品

D.替代性商品