更多“换热器中加折流挡板主要是增加流体的湍流程度，从而提高传热系数”相关的问题
根据下列文章，回答26～30题。 It is a wise father that knows his own child, but today a man can boost his paternal (fatherly) wisdom—or at least confirm that he’s the kid’s dad. All he needs to do is shell out $30 for a paternity testing kit (PTK) at his local drugstore—and another $120 to get the results.More than 60,000 people have purchased the PTKs since they first became available without prescriptions last years, according to Doug Fogg, chief operating officer of Identigene, which makes the overthecounter kits. More than two dozen companies sell DNA tests directly to the public, ranging in price from a few hundred dollars to more than $2500.Among the most popular : paternity and kinship testing , which adopted children can use to find their biological relatives and families can use to track down kids put up for adoption. DNA testing is also the latest rage among passionate genealogists—and supports businesses that offer to search for a family’s geographic roots.Most tests require collecting cells by swabbing saliva in the mouth and sending it to the company for testing. All tests require a potential candidate with whom to compare DNA．But some observers are skeptical, “There is a kind of false precision being hawked by people claiming they are doing ancestry testing,” says Trey Duster, a New York University sociologist. He notes that each individual has many ancestors—numbering in the hundreds just a few centuries back. Yet most ancestry testing only considers a single lineage, either the Y chromosome inherited through men in a father’s line or mitochondrial DNA, which is passed down only from mothers. This DNA can reveal genetic information about only one or two ancestors, even though, for example, just three generations back people also have six other greatgrandparents or, four generations back, 14 other greatgreatgrandparents.Critics also argue that commercial genetic testing is only as good as the reference collections to which a sample is compared. Databases used by some companies don’t rely on data collected systematically but rather lump together information from different research projects. This means that a DNA database may have a lot of data from some regions and not others, so a person’s test results may differ depending on the company that processes the results. In addition, the computer programs a company uses to estimate relationships may be patented and not subject to peer review or outside evaluation. 第 26 题 In paragraphs 1 and 2 , the text shows PTK’sA．easy availability.B．flexibility in pricing.C．successful promotion.D．popularity with households.
A.MoreB.AmongC.MostD.ButE.CriticsF.easyG.B．flexibilityH.C．successfulI.D．popularity
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域名中的int是指( )。
A．商业组织B．国际组织C．教育组织D．网络支持机构
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男性，35岁。右大腿被速度较快的汽车撞伤，伤后右大腿下1/3向后成角，局部明显肿胀，不能扪及足背动脉搏动，足趾发凉。诊断首先要考虑（）
A.股骨下1/3骨折伴软组织挫伤
B.股骨下1/3骨折伴血肿
C.股骨下1／3骨折伴股动脉损伤
D.股骨下1／3骨折伴股静脉损伤
E.股骨下1／3骨折伴股神经损伤
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{{*HTML*}}根据《计量检定人员管理办法》，注册计量师不得有的行为包括（ ）。
A．伪造、篡改数据，报告，证书或技术档案等资料
B．使用未经考核合格的计量标准开展计量检定
C．违反计量检定规程开展计量检定
D．出具《检定结果通知书》
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贷款五级分类法将贷款分为哪五类（）。
A.正常
B.关注
C.次级
D.可疑
E.损失
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按照Q/HB-J-08.L24-2009《中国华能集团公司水力发电厂水轮机监督技术标准》规定，水轮机在运行过程中，气味一般不需要监视。
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刮痧美容操作后，一小时内不能用冷水洗脸，（）小时内不能化妆、热敷。
A.一
B.二
C.三
D.四
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下列关于国内期货结算制度的说法中，正确的是______。
A.期货交易所可以实行会员分级结算制度
B.实行会员分级结算制度的期货交易所会员由结算会员和非结算会员组成
C.实行会员分级结算制度的期货交易所，应当向结算会员收取和追收保证金
D.实行会员分级结算制度的期货交易所既对结算会员结算也对非结算会员结算
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电动机的转速通过多级传动副传到主轴，若每级传动副的主动轮的直径或齿数最大，从动轮的最小时，主轴得到的是______转速。
A．最高
B．最低
C．中等
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《道路交通安全法》明确把电动自行车划为（）进行管理。
A.机动车
B.非机动车
C.蓄力车
D.普通自行车
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“沉舟侧畔千帆过，病树前头万木春”，这句唐诗蕴含的哲学原理是( )。
A．矛盾是事物发展的动力
B．事物是本质和现象的统一
C．新事物代替旧事物是事物发展的总趋势
D．事物的发展是量变和质变的统一
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市政道路工程施工资料中下列施工记录需归入城建档案馆归档保存的是（）。
A . 回填施工记录
B . 软基分层沉降检测记
C . 孔隙水压力观察记录
D . 深层搅拌桩施工记录
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非全面调查中最完善、最有计量科学根据的方式方法是()A、重点调查B、典型调查C、抽样调查D、非全
非全面调查中最完善、最有计量科学根据的方式方法是() A、重点调查 B、典型调查 C、抽样调查 D、非全面统计报表
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RCPMIS系统中，（）负责管理本级业务操作员和下级系统管理员。
\tA.系统管理员
\tB.业务操作员
\tC.业务管理员
\tD.系统操作员
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