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关于方案的图纸要求，是1号图（841mm×594mm）3-4张。（）
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Operating SystemsDear Mr. Tech,I'm considering buying a new （ 1 ）. However, I don’t know which operating （ 2 ） to choose. Which one do you recommend?–James in GlenwallDear James,Each operating system (OS) has different benefits. Apple ® produces a popular （ 3 ） called OS X ® . This system has fewer known viruses than other systems. Microsoft ® makes an OS called Windows ® . One of its benefits is software compatibility. （ 4 ） works with a wide variety of programs. Finally, there is also the Linux ® OS. Linux ® is open （ 5 ） and easy to customize. I hope this helps you make your decision!– Mr. Tech
Engineer 2 prefers OS X® over Windows®.
OS X® is less likely to get viruses.
中国共产党在遵义会议上集中全力解决的主要问题是（）
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