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一个完整的尺寸应包括尺寸界线、尺寸线、尺寸的起止符号和尺寸数字。()

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刚体是一种理想模型，实际构件都是可变形的。()

From: Cindy West＜cindy@consumersurvey.com＞ To: Jack Graham＜jgraham@txcomputer.com＞ Subject: Survey Results Dear Mr. Graham, Between April 1st and June 30th, we phoned 2,000 TX computer users. We asked for their opinion about the products and services offered by your company. 1,150 agreed to share their views. 1,040 said that they were either satisfied or very satisfied with the product and service they received. Thats 90% of everyone who answered. I attached all the data in this email as well as a comprehensive analysis of the responses. Briefly, the results indicate that your customers value the speed and durability of TX computers. Many respondents mentioned that your computers still function perfectly even after several years of ownership. However, some people were not satisfied with the customer service or the delivery options that were offered. I hope you will find this information helpful. Id be happy to answer any questions you might have, so please dont hesitate to call. Sincerely, Cindy West Consumer Behavior. Analyst
What is the purpose of the e-mail？

A. To announce a discount on computers
B. To summarize a set of data
C. To promote a new type of a computer
D. To apologize for a late delivery

根据《建设工程工程量清单计价规范》，预留金是由清单编制人根据业主意图和拟建工程的实际情况而估算的。()

压缩非仪表压缩空气的压缩机选用无油润滑的空气压缩机组。()