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如果植物缺氮，叶片生长不会受到明显影响，只是植株矮小。( )

A. 对
B. 错

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Most people would be (21) by the high quality of medicine (22) to most Americans. There is a lot of specialization, a great deal of (23) to the individual, a (24) amount of advanced technical equipment, and (25) effort not to make mistakes because of the financial risk which doctors and hospitals must (26) in the courts if they (27) things badly. But the Americans are in a mess. The problem is the way in (28) health care is organized and (29) . (30) to pubic belief it is not just a free competition system. The private system has been joined a large public system, because private care was simply not (31) the less fortunate and the elderly. But even with this huge public part of the system, (32) this year will eat up 84.5 billion dollars—more than 10 percent of the U.S. Budget—large number of Americans are left (33) . These include about half the 11 million unemployed and those who fail to meet the strict limits (34) income fixed by a government trying to make savings where it can. The basic problem, however, is that there is no central control (35) the health system. There is no (36) to what doctors and hospitals charge for their services, other than what the public is able to pay. The number of doctors has shot up and prices have climbed. When faced with toothache, a sick child, or a heart attack, all the unfortunate persons concerned can do is (37) up. Two thirds of the population (38) covered by medical insurance. Doctors charge as much as they want (39) that the insurance company will pay the bill. The rising cost of medicine in the U. S. A. is among the most worrying problems facing the country. In 1981 the country’s health bill climbed 15.9 percent—about twice as fast as prices (40) general. 21().

A. to finance
B. financed
C. the finance
D. to be financed

简述违约责任的特点。

2003年2月10日，董某从某汽车厂物资经销公司购买了一辆载重10吨的半挂汽车。同年2月21日，董某用该车装载10台三类汽车底盘(每台底盘重1.29吨，共超重2.9吨)运往某市。当董某架车行使了1033千米时，挂车后右外侧轮钢圈突然破碎，致使该车在行驶中向右侧翻车。经事故发生地交通警察大队认定，造成该车翻车的主要原因是由于挂车后右外侧轮钢圈破碎所致。破碎的后右外侧轮钢圈经国家汽车质量监督检验中心仲裁检验，结论为“轮辐所用钢材有分层、夹渣及焊接处断口、裂纹等缺陷”致使开裂。翻车事故发生后，董某为维修该车所载货物花修理费9000元，吊车费2100元，钢圈质量鉴定费2000元，交通费600元，车辆看护费500元，合计人民币1.42万元。停运损失3万元。董某就所遭受到的损失请求汽车厂予以赔偿。汽车厂应如何承担责任

简述违约金的特征。