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  3. To: Robert Williams, School of Architecture From: James. Johnson Subject: Air-conditioning Installation Costs for East Hal

To: Robert Williams, School of Architecture From: James. Johnson Subject: Air-conditioning Installation Costs for East Hal

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问题    To: Robert Williams, School of Architecture
   From: James. Johnson
   Subject: Air-conditioning Installation Costs for East Hall
   Date: June 4, 2015
   I am writing to inform you of the costs of installing air-conditioning for the seven offices and two studio classrooms in East Hall.
   Office and Classroom Installation
   Estimates were obtained from three contractors on the costs of covering the offices and class-rooms. All these three were in the $20, 000 to $25, 000 range. The work would take about three weeks.
   Because the central unit would be installed on the roof, some noise problems might occur during a four-or five-day period.
   Additional Installation
   Because a larger installation, including a more powerful central unit, would be necessary to handle the halls and stairways, an additional $ 6, 000 would be required for the equipment. If this additional work were delayed until a later time, a new central unit would be required along with changes in the pipe way.
                     Subject:【R1】______Costs for East Hall
   Office and Classroom Installation
   a. Covering area: seven offices and two【R2】______.
   b. Possible problem: some【R3】______might occur during a four-or five-day period.
   Additional Installation
   a. Budget: $6, 000.
   b. A more powerful【R4】______, is needed to handle the halls and stairways.
   c. Additional installation postponement will result in changes in【R5】______.  
【R4】
选项
答案central unit
解析 从原文“a more powerful central unit，would be necessary to handle the halls and stairways”可得到答案。
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