波的对比，应有（）基本原则。 A.同相性 B.振幅增强 C.波形相似

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问题：

波的对比，应有（）基本原则。

A.同相性

B.振幅增强

C.波形相似

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某企业12月31日“银行存款——美元”账户余额为200 000美元，当日汇率为 1:8.4。1月31日“银行存款——美元”账户余额180000美元，当日汇率为1:8.35。设企业没有其他的外币业务账户，则1月31日的汇兑损益为( )。

A．10 000元

B．9000元

C．-9 000元

D．-10000元

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下列说法正确的是[ ]

A．工业集聚可获取规模效益，因此工业不宜分散布局

B．许多地方的经济开发区是先建基础设施再吸引投资者建厂

C．当前发展中国家的经济主要集中在技术密集的专业化工业集聚区域内

D．绝大多数产品从原料开始的全部加工过程是在一个工厂里独立完成的

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（12分）如图所示，两根质量均为m、电阻均为R、长度均为l的导体棒a、b，用两条等长的、质量和电阻均可忽略的、不可伸长的柔软长直导线连接后，b放在距地面足够高的光滑绝缘水平桌面上，a靠在桌子的光滑绝缘侧面上；两根导体棒均与桌子边缘平行。整个空间存在水平向右的匀强磁场，磁感应强度为B。开始时两棒静止，自由释放后开始运动，导体棒a在落地前就已匀速运动，此时导体棒b仍未离开桌面。已知两条导线除桌边拐弯处外其余部位均处于伸直状态，导线与桌子侧棱间无摩擦。

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完形填空。
The story tell us about the British writer, Richard Savage. He was once living in London with_ 1_ money in his pockets. In order to get some food and clothes he wrote the story of his life and managed to have it _2__ .But not many copies of his books were __3_ in the shops, and he was still living a hard life. Because of anxiety and malnutrition, he became very weak and before long fell _ 4_ ,and a doctor was sent for. The doctor was not rich enough, but __5_ literature. He tried his best to cure Savage of his illness and a week later Savage was out of __6_ When he finally recovered his __7_ , the doctor sent a bill to Savage for his __8_ ,but poor Savage had no money to __9_ it. The doctor waited for a month and sent another bill. __10_ no money again, the doctor went to Savage himself. " You know you __11_ your life to me," said the doctor, "and I should _12__ some thankfulness from you." "I __13_ ," said the writer, " you've done a great favour for me and to __14_ that I'm not ungrateful for your kindness, I'll __15_ my life to you." With these _16__ he handed the doctor two copies of The Life of Richard Savage. The doctor took the books home and began to __17_ them carefully. "I see I've _18__ the life of a great writer," the doctor said to himself with a sense of pride. " Maybe this is the only thing I could be really __19_ in my life." Five years later Savage called on the doctor to pay his bill, only to find that the doctor had already _20__.
( )1.A. much ( )2.A. published ( )3.A. bought ( )4.A. weak ( )5.A. was interested in ( )6.A. safety ( )7.A. sight ( )8.A. care ( )9.A. pay ( )10.A. Receiving ( )11.A. promise ( )12.A. wish ( )13.A. refuse ( )14.A. explain ( )15.A. offer ( )16.A. words ( )17.A. write ( )18.A. made ( )19.A. fond of ( )20.A. passed away	B. a little B. found B. sold B. anxious B. was familiar with B. power B. health B. aid B. supply B. Received B. return B. choose B. agree B. prove B. contribute B. drills B. correct B. saved B. famous for B. escaped	C. little C. encourage C. printed C. frightened C. was popular with C. danger C. movement C. a ttention C. afford C. Keeping C. lend C. get C. warn C. describe C. give C. compositions C. improve C. trained C. proud of C. hurried off	D. enough D. protected D. showed D. ill D. struggled against D. injury D. action D. treatment D. allow D. Kept D. owe D. master D. suppose D. plan D. damage D. collections D. read D. taught D. worried about D. run away

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2010年5月21日，中 * * 政治局委员徐才厚近日在四总部机关调研时强调，要坚持把中国特色社会主义理论体系武装作为建设学习型党组织的首要任务，深入学习邓 * * 理论和“三个代表”重要思想以及科学发展观。对上述材料的理解正确的是 [ ]

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③中国特色社会主义理论体系是我们必须坚持的固定的“指导思想”

④只有坚持中国特色社会主义理论体系，才能保持党的先进性

A．①②③

B．①②④

C．②③④

D．①③④

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