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单位内各区域电气室（包括计算机房）、电缆夹层，应设有哪些装置及措施？

答案

参考答案：

火灾自动报警器、烟雾火警信号装置、监视装置、灭火装置和防止小动物进入的措施；电缆穿线孔等应用防火材料进行封堵。

填空题

声音的传播______（选填“需要”或“不需要”）介质，2010年4月2日下午，王家岭煤矿透水事故救援工作过程中发现事故井下有生命迹象（如图），原来是被困人员通过敲击钻杆，发出“当当”的求救信号，这里利用了______传声效果比气体好的物理知识．

参赛者甲乙丙
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单项选择题

In order to increase revenues, an airport plans to change the parking fees it charges at its hourly parking lots. Rather than charging $2.00 for the first two-hour period, or part thereof, and $1.00 for each hour thereafter, the airport will charge $ 4.00 for the first four-hour period, or part thereof, and $1.00 for each hour thereafter.
Which of the following is a consideration that, if true, suggests that the plan will be successful in increasing revenues

A．Very few people who park their cars at the hourly parking lot at the airport leave their cars for more than two hours at a time.

B．Over the past several years, the cost to the airport of operating its hourly parking facilities has been greater than the revenues it has received from them.

C．People who leave their cars at the airport while on a trip generally park their cars in lots that charge by the day rather than by the hour.

D．A significant portion of the money spent to operate the airport parking lot is spent to maintain the facilities rather than to pay the salaries of the personnel who collect the parking fees.

E．(E) The hourly parking lots at the airport have recently been expanded and are therefore rarely filled to capacity.
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