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直流锅炉具有哪些特点？
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Write down the numbers of the topic sentences in the following passages. ①If you hadn't known them, you would have thought Joe and Jim were quite alike. ②They were both tall and wore long and fair hair. They both walked with a steady stride (坚定的步伐). ③They both spoke in a deep voice that made them selves seem much older than they really were. ④Both of them wore dark clothes as a rule, and they liked light coloured ties. ⑤But that was all the likeness they had. ⑥In other things they were sharply different. ⑦Joe was considerate and helpful, and everyone liked him. ⑧Jim, however, was very selfish and often flared into terrible anger (勃然大怒) at little things that displeased him. ⑨Alike as Joe and Jim were on the surface, they were really very different in nature.
应变的警报信号中，如警铃或汽笛三长声，连放1分钟，应是（）的应变？
向井内下入套管，并向井眼和套管之间的环形空间注入水泥的施工作业称之为（）
波士顿矩阵的应用中"明星"业务，处于第（）象限。
《疏浚工程土石方计量标准》JTJ／T321中规定，条件许可时，竣工测量宜在（）d内完成。
《七略》的成书时期是在（）。
污染源
脾的主要生理功能不包括（）。
洗地机有各种型号，使用时应针对不同的工作现场和目的选用不同的型号，通常清洗地面多用（）英寸的洗地机。
如果服务小区的重选迟滞的修改值在网管显示的是4，那么在消息里看到的不可能是（）