Estimates were obtained from three contractors on the costs of covering the offices and class-rooms. All these three were in the

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问题     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. And this work could be started from this weekend, and the over-time labor costs of about $1,500 have been included in the estimates.
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: (46)______  Costs for East Hall
Office and Classroom Installation:
    1. Covering area: seven offices and two (47)______
    2. Possible problem: some (48)______  might occur during a four- or five-day period
Additional Installation:
    1. Budget: $6,000
    2. A more powerful (49)______  is needed to handle the halls and stairways
    3. Additional installation postponement will result in changes in (50)______

选项

答案central unit

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