A：所谓的棚户区，是指城市建成区（含偏远工矿区）范围内，建设于上世纪80年代以前、以平房或简易楼房为主、人均住房面积小、缺乏公共服务和基础配套设施、居住人口达到100户以上的非成套住宅区。棚户区交通不便利、治安和消防隐患大、环境卫生脏、乱 ...

Th Artemis II mission will take four astronauts thousands of miles beyond the moon before the Orion spacecraft makes a U-turn and heads back to Earth on an approximately 10-day journey. The launch ...