瓦斯管理在安全方面的要求包括哪些？（） ["矿井总回风巷或一翼回风巷中瓦斯或二氧化碳浓度超过1.O%时，必须立即查明原因，进行处理","加强通风管理，防止瓦斯超限","严禁带电移挪电气设备","临时停工的地点不得停风；否则，必须切断电源、设置栅栏，揭示警标，禁止人员进入，并向矿调度室报告","对因瓦斯浓度超过规定被切断电源的电气设备，必须在瓦斯浓度降到1.5%以下时，方可通电开动"]
产品缺陷责任的构成要件有哪些？
物理吸附
You want to drop the TBS1 tablespace from your database. You also want to delete the corresponding data files automatically， and not have to do it manually. What should you do？（） ["Use the DROP DATAFILE command.","Use the DROP TABLESPACE command.","Ensure that all database files are Oracle Managed Files before using the DROP TABLESPACE command.","Ensure that the DB_FILE_CREATE_DEST initialization parameter is set before using the DROP TABLESPACE command."]
男性，47岁，毕‖式胃大部切除手术后第5天，突发右上腹剧痛、发热，伴有腹膜刺激征，应考虑（） ["倾倒综合征","上消化道出血","十二指肠残端破裂","吻合口梗阻","输入襻梗阻"]
抑郁症的主要表现是四低，即情绪和兴趣降低、（）降低、（）降低、身体健康状况降低。
