输电线路是指电压（）KV以上的电力线路 ["1","10","35","110"]
【背景资料】某9层住宅项目，某装饰施工单位负责内外装饰装修，装饰内容较多，竣工后不久发现部分楼层水泥砂浆地面大面积起砂、空鼓、裂缝，外墙砖空鼓、脱落等。
请根据背景资料完成相应小题选项对严重起砂的地面，应把面层铲除后，重新铺设水泥砂浆面层。
Which three statements are true about memory buffer allocation by a MySQL Server?（） ["Global buffers such as the InnoDB buffer pool are allocated after the server starts, and are never freed","Thread buffers are allocated when a client connects, and are freed when the client disconnects","Buffers that are needed for certain operation are allocated when the operation starts, and freed when it ends","User buffers are allocated at server startup and freed when the user is dropped","All dynamic buffers that are set with a SET GLOBAL statement immediately get allocated globally, and are never freed"]
不能用于交流鼠笼式异步电动机的调速控制方法是（）。 ["A、变电源频率调速 ","B、变极对数调速 ","C、串级调速 ","D、变电源电压调速"]
A recently installed package needs to be rolled back to a previous version. Which of the following commands will perform the task？（） ["reject","cleanup","deinstall","uninstall"]
修剪的技术要点：
