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简答题 在氨基酸态氮测定中，为什么要加入甲醛？
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An increase in free parks in Shanghai might be pleasant, but they bring with them their own problems. There are already 122 free parks for citizens to enjoy. But visitors are often hassled by beggars and fortune-tellers, and put off by the smell of urine left behind by someone using the grass as a toilet. Law and order in free parks are also worrying the city’s park operators. They couldn’t take any mandatory measures on those who do indecent things in parks except to try to persuade them to stop according to local regulations on park operations, which were laid out many years ago and many parts are not in line with the need for maintenance of the increasing number of free parks. Patrols could be introduced to help park managers. On April 1,2005, Shanghai opened 23 new free parks, bringing the total number of such parks to 122. A lack of cash has also hindered park operations. The local government has allowed for subsidies to cover the cost of not charging for tickets, but attendance is often more than expected, adding to maintenance and security costs. Many parks manage to be self-supporting by running businesses such as convenient stores and cafeterias. Some also rent out areas to companies who want to do outdoor promotions. But the bottom line is that parks should be comfortable places for visitors and should not be turned into outdoor markets. As well as not charging for tickets, parks are cutting back on staff, having a few staff members for daily operations. Most construction and maintenance jobs are commissioned to enterprises through public bidding so as to evaluate costs in a transparent and economical way. So far, more than 12,000 citizens are working as volunteers to help with park operations in Shanghai. Shanghai has spent more than 3 per cent of its GDP on environmental protection in recent years. Its heavy expenditure in landscaping also paid off as it won the "National Garden City" award last year. Shanghai’s goal is to increase its green area to 12 square metres per capita. It now has more than 17 million permanent residents. Which of the following is NOT the way how free parks make money to support themselves according to the text
(133～134题共用题干)患者，男，62岁，5年来站立、咳嗽时反复出现左侧腹股沟肿块，呈梨形，平卧可消失，12小时前搬家具时肿块增大，有明显疼痛，平卧和手推均不能回纳，肛门停止排便排气，诊断为腹外疝入院治疗。 该患者最合适的治疗措施是
(135～136题共用题干)患者，男，56岁，患类风湿性关节炎20年，全身关节活动受限，生活部分自理，三天前患者企图自杀被家人发现，及时将其送往医院接受治疗，门诊以“重度抑郁症”收治入院。 对患者实施给药护理时，正确的做法是
(127～128题共用题干)患者，男，55岁，慢性肾小球肾炎10年，1周前受凉后出现食欲减退，恶心、呕吐，晨起明显，夜尿增多。内生肌酐清除率为30ml/min。 为了维持水、电解质、酸碱平衡，下列护理措施不正确的是
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