焊接不锈钢的氩弧焊机一般有______和______两种。
参考答案:交流;直流
按要求完成下列句子。
1. He will fly kites with his friends tomorrow.(对画线部分提问)
______ ______ _____ fly kites with his friends?
2. Sally is swimming ln a river.(改为一般疑问句)
_____Sally ______in a river?
3. Sally will buy a new jacket. (改为同义句)
Sally_____ _____ _____ _____a new jacket.
4. Were there many old buildingsnear our school last year? (作肯定回答)
______,_________ ________.
5. Sally went shopping last Saturday.(改为否定句)
Sally_____ _____shopping last Saturday.
为规范物业管理市场秩序,加强对物业服务企业经营活动的管理,1999年原建设部印发了( )。
A.《全国优秀管理住宅小区标准》B.《城市住宅小区物业管理服务收费暂行办法》C.《关于实行物业服务企业经理、部门经理、管理员岗位培训合格上岗制度的通知》D.《物业服务企业资质管理试行办法》