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按要求做题. 1. Ben started to collect coins about 4 years ago. (改为同义句) Ben ____________ ____________ collecting coins for 4 years. 2. I don't have my own dictionary,so I have to share one with my brother. (改为同义句) I don't have a dictionary ____________ my ____________, so I have to share one with my brother. 3. He learned to swim when he was 7 years old. (改为同义句) He learned to swim ____________ ____________ ____________ ____________7. 4. He has been working for five years . (就画线部分提问) ____________ ____________ has he been working? 5. She asked me if I would go to the cinema the next day. (改为直接引语) She asked me, '____________ you ____________ to the cinema ?'
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【简答题】空调系统中，空气处理设备的电加热器是由电流通过()发热来加热空气的设备。
【单选题】空气过滤系统中空气加热器的作用是
A.
对空气加热灭菌
B.
升高空气温度，以降低空气的相对湿度
C.
对空气加热，蒸发除去空气中的部分水份
D.
升高空气温度，杀灭不耐热的杂菌
【简答题】空调系统通常由空气处理设备、空调风系统、（ ）等组成。