2003年9月全国大学英语四级考试真题和答案 Part I Listening Comprehension(20 minutes) Section a Directions: In this section, you will hear 10 short conversation. At the end of each conversation, a lestion wilt be asked about what was said. Both the conversation and the question will be spoken only

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2002年6月全国大学英语四级考试真题和答案 Part I Listening Comprehension (20 minutes) Section A Directions: In this section, you will hear 10 short conversations. At the end of each conversation, a question will be asked about what was said. Both the conversation and the question will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked

四川省内江市东兴区2009级10月高三语文联考试题_四川省内江市东兴区2009级10月语文联考试题

2008英语四级作文常用语句 开篇使用 1、Many nations have been faced with the problem of... 许多国家都面临着**问题 2、Recently the problem has been brought into focus. 近来,**问题成为焦点 3、Recently the phenomenon has become a heated topic. 近来,现象成为热点话题

第三章习题处理 1.设中断级屏蔽位“1”对应于开放,“0”对应于屏蔽,各级中断处理程序的中断级屏蔽位设置如下:

1.2地震的一些基本概念 什么是地震? 地震是指因地球内部缓慢积累的能量突然释放而引 起的地球表层的振动。 地震是一种自然现象,地球上每天都在发生地震 年约有500万次。其中约5万次人们可以感觉到;能造 成破坏的约有1000次;7级以上的大地震平均一年有十 几次。目前记录到的世界上最大地震是8级,发生于 1960年5月22日的智利地震

2003级《大学数学I》第一学期期末考试试题 一。填空题(每小题3分共15分) 2.1=fxy)y改变积次序为1= 3.假设f(x)是周期为2的函数,它在[-,]内的表达式为f(x)=x,则f(x)展开成Fourier级数时,bn=

四川省内江六中高2010级高三第四次月考试题_内江六中高2010级语文第四次月考试题

第五讲制冷压缩机和辅助设备选型计算 一、选型的一般原则 (一)型号 1、尽可能选用大型压缩机; 2、同一机房内选配压缩机的型号不宜超过两个系列; 3、采用双级压缩循环时,应优先选用单机双级压缩机。 (二)台数 1、压缩机配备台数应尽量少,但不宜少于两台; 2、压缩机总制冷量以满足生产要求为准,不考虑备用机; 3、避免“大马拉小车