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单项选择题

窗口傅里叶变换是引入一个时间函数作为窗口函数,窗口函数在有限区间内恒等于()。
A、0
B、1
C、2
D、3

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单项选择题
Old Car Tyres
Car tyres are a big problem for the environment. Tyres are non-degradable and if you burn them, they send toxic gases into the environment. If you just store them under the ground, they can give off toxins and chemicals into the dirt around them. Almost every country has introduced laws that deal with old tyres, with many countries not allowing them to go into the garbage at all. The good news is that rubber tires can be reused in many different ways:
·             You can reuse them and use them again on vehicles.
·             You can use them for the sides of boats to stop them from crashing into the harbour walls.
·             You can use them for children's play equipment.
·             You can make old tyres into computer mouse mats, pencil cases, and notebook covers.
·             You can break them down into little bits and put them on the surface of playgrounds to make them safer for children or on roads to reduce the noise.
·             You can reuse them as carpet mats and tiles. Several carpet manufacturers use recycled tyres as a major part of their carpets.
 
To reduce your tyre waste, take care of the tyres you have:
·             Purchase good quality tyres that have a long life.
·             Check the tyre pressures so that you’re not driving on tyres that are too hard or too soft.
·             Change the position of the tyres every 6,000 miles from the front of the car to the back of the car.
When it's time to replace your tyres, either take your vehicle to a vehicle service shop that recycles tyres (they may charge a small fee for the recycling part of the service) or, if you replace the tyres yourself, check with your local government or recycling service provider to find out where you can drop them off for recycling near you. In some areas, tyre shops will take them back for a small fee.
Choose the correct answers.
Some tyre shops will…
A、sell you new tyres in some areas.
B、take your old tyres back for a small fee.
C、sell your new tyres for a small fee.
D、 recycle your old tyres.
单项选择题
《移动式压力容器安全技术监察规程》规定：当连接紧急切断阀的管路破裂，流体通过紧急切断阀的流量达到或者超过允许的额定流量时，装卸管路或者紧急切断阀上的过流保护装置应当（）。
A、开启
B、关闭
单项选择题
在计算项目财务现金流量时，下列费用中的（   ）为现金流出
A、经营成本
B、折旧
C、利息支出
D、应付款项
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