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验收指材料、设备进场的检查或成品、半成品、隐蔽工序的质量检査;复验指验收不通过时,更换材料、设备或重新施工后再次验收。复验与验收的程序、要求一样,但抽查率比验收高。()

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According to the author, what is the definition of American Dream？

A. There is no definite answer.
B. Financial success.
C. Happiness.
D. Home ownership.

产品价格完全由市场供求决定。()

条码识读器是利用条和空对光的()不同来读取条码数据的。

You are supposed to write for the Youth Volunteers Association a notice to recruit volunteers for its Summer Teaching Program. The notice should include the basic qualifications for applicants and other information which you think is necessary. You should write about 100 words. Do not sign your own name at the end of the letter. Use " Youth Volunteers Association" instead.