某定风量空调系统采用无机玻璃钢风管，由于机房空间受限，无法安装消声器，送风管途经相邻的空调房间吊顶(没开风口)后，再设置消声器，送至使用区，使用区空调送风噪声指标正常，机房隔声正常，但途经的房间噪声指标偏高，下列哪几项解决噪声的办法是不可取的
A．加强机房与空调房间隔墙墙体的隔声
B．途经该房间的无机玻璃钢风管加包隔声材料，吊顶增加吸声材料
C．使用区末端送风口增加消声器
D．途径该房间的送风管截面面积加大一倍
参考答案：A,C
解析： 使用区噪声指标正常，不用在送风口处加消声器，机房隔声正常，不需要在机房加隔声措施，故选项AC错。
| Nine states and the District of Columbia are doing away with the sales tax on items such as clothes, shoes and even notebooks over the next few weeks, just in time for back-to- school shopping. Most of the promotions last only a few days, so shoppers will have to act quickly to get a tax break. The tax holidays, which have already expired in two other states, apply to small and large items. For example, the tax break applies to any school supply that costs $15 or less in New Mexico. In Massachusetts, it covers most retail purchases of $2,500 or less. Stores may offer additional savings because these events "give retailers an opportunity to have a sale on top of what the state is doing," says Verenda Smith, government affairs associate at the Federation of Tax Administrators. No industry-wide figures are available about how much consumers save annually from these tax breaks. But Texas estimates that shoppers will save $47.4 million in taxes this year, nearly a 3 percent increase from the previous year. Massachusetts says shoppers saved roughly $10 million in taxes during its 2005 event. States that cast aside these promotions when a slow economy pinched state budgets are now reviving them in hopes of stimulating local economies. Some states also believe the gain in consumer goodwill helps balance out the loss in tax revenue. In some cases, tax losses are minimal because serious shoppers don’t stop at clothes and books. "While states give up sales tax, they usually break even on sales-tax collection," says J. Craig Shearman, a vice-president at the National Retail Federation. Sophie Beckmann, a certified public accountant at A. G. Edwards in St. Louis, says she’ll avoid that temptation by making a list of necessities. On the Missouri resident’s shopping list: notebooks, pencils, glue and three or four outfits for her son, who is entering the fifth grade this month. She plans to pocket any tax savings. "When you start buying more and spending more just because of the savings, then you’re not doing yourself a favor," Beckmann says. |
All the following terms that appear in Paragraph 2 refer roughly to the same as "tax-free shopping" EXCEPT ______ .
A．shoppers
B．tax breaks
C．tax holidays
D．promotions