8.1 INTRODUCTION The purpose of this chapter and Chap. 9 is to develop shock-wave theory, thus giving us the means to calculate the changes in the flow properties across a wave.本章和第九章的目的是推导激波理论,因而得出计算通过激波的流动特性变化量的公式

一、单项选择题(在下列每小题四个备选答案中选出一个正确答案,并将其字母标号填入“答卷”纸上相应题号的括号中。每小题1分,共20分) 1.在音节zi、ji、zhi中,i、一i(前)、i(后)是 A.一个音位的不同变体 B.两个音位,i是一个音位,一i(前)、一i(后)是一个音位 C.两个音位,i和一i(前)是一个音位,一i(后)是一个音位 D.三个音位

一、影响传热膜系数的因素 1、流体流动状态 层流:忽略自然对流时,层流底层=r湍流:主要热阻在层流层,Re↑,边界层减薄,a(注意管件、内构件影响,Re层2000?)

1写出苯甲醛与下列试剂反应的主要产物。 (1). (CH,CO)/ NaAc. A Ho (2). NaC, /NH,) (3). CHNO, /HO (4).CH3CHO/稀OH (5).CCOCH3OH△(6)浓OH

TABLEs have been redesigned to make key information even more accessible to students CONCEPT CHECKS summarize each section and provide quiz questions, so students can evaluate their understanding as they progress through the chapter CONCEPT LINKs alert students to material that builds on previous concepts and provides a useful cross-referencing

1. 1 Promotion of exports from developing countries to the European Union(EUand other industrialized countries-al n overview Supplying safe and high quality foods is more important than ever, as importers of food products demand safe food in compliance with strict hvgiene rules Quality improvement, however, is a continuous process The present concems in quality with respect to insects, extraneous matter, moisture, ash, micro-organisms insects, mites, mycotoxin, pesticide residues, heavy metals, non permitted colors, animal excreta, etc. will be

4.1 Staff training programme including records 4.1.1 All employees should be informed in writing of their legal obligations and the company's policy on personal hygiene prior to commencing work, with periodic updates as necessary. It is recommended that a standard induction course explaining the relevant legislation is designed and used by all QA managers for new staff

1.总压为101.3kPa下,用苯、甲苯的安托因方程(见例9-1),求(1)温度为108℃及81℃时,苯对甲苯的相对挥发度: (2)用上述计算的相对挥发度的平均值a,计算苯一甲苯的汽液平衡数据,并与书末附表所列的实验值作比较(列表)

1.设x)在(-∞,+∞)内可导,且对任意x1,x2,x1>x2时,都有fx1)>fx2),则 (a)对任意x,f(x)>0(b)对任意xf\(x)≤0 (c)函数f(一x)单调增加 (d)函数f(一x)单调增加

(二)质量检查 1.重量差异检查。选外观合格的空白片20片,按《中国药典》2005年版二部附录A 方法进行检查。根据实验结果,判断是否合格。将检查结果填入表6-1中