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软件开发模型用于指导软件的开发。演化模型是在快速开发一个 (1) 的基础上，逐步演化成最终的软件。螺旋模型综合了 (2) 的优点，并增加了 (3) 。喷泉模型描述的是面向 (4) 的开发过程，反映了该开发过程的 (5) 特征。
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The texture of the soil depends on the relative amounts of different-sized particles that combine to make up the soil. These particles can be as large as stone and gravel or as small as clay. A typical clay soil is composed of approximately 60 percent actual clay, 20 percent silt, and 20 percent sand. The particles in a sandy soil are so fine that it tends to be compact and interferes with the oxygen supply for plant roots. Water has trouble entering this impervious soil, and runoff is very common during rainfalls. A typical light sandy soil is composed of approximately 70 percent sand, 20 percent silt, and 10 percent clay. The particles in a sandy soil are comparatively large, permitting water to enter the soil and to pass through it so quickly that it often carries nutrients with it and dries out very rapidly. The texture of sandy soils is generally very difficult to modify because huge amounts of organic material must be added. A typical loam soil is composed of approximately 40 percent sand, 40 percent silt, and 20 percent clay, making it an ideal garden soil. It is easily worked and retains water and nutrients, which are slowly absorbed by plant roots. A typical adobe soil is a clay soil present in hot, dry areas of the country and is often very hard and cracked. It has all the disadvantages of a heavy clay soil and, being much drier, is more difficult to correct. What is most likely to happen to rainwater when it falls on sandy soil
某甲到其住所地工商局申请个人独资企业登记，工商局工作人员某乙要求其使用工商局统一格式的申请书，并向某甲收取了合理的工本费用。之后，某乙告知某甲材料不全并且其中一个材料类似商业广告，要求其修改并按照公示牌列表补交其他材料，但未出具任何书面凭证。某甲在仔细查看后，发现公示牌上确实没有相关内容，觉得某乙是故意刁难，一气之下将公示牌踢坏。双方因此发生争执。某派出所民警某丙赶到后，询问了相关人员，根据证人证言以扰乱公共秩序为由对某甲当场作出罚款200元的行政处罚，并要求某甲当场缴纳。 下列关于某丙作出的处罚行为，说法正确的是( )。
在金融期权交易中，期权的购买者需要开立保证金账户，并缴纳保证金。( )
市场结构就是指市场中不同行业的上市公司的组成情况。( )
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