【判断题】生产系统长期停车或卸出催化剂之前,都需要对催化剂进行钝化,目的是再次使用时,只需稍加还原即可投入生产。()
【简答题】After being rescued from the air crash, the people agreed that they had much to ________. A) thank B) be thanked C) be thankful D) be thankful for
【判断题】建立冗余数据最常用的技术是数据转储和登录日志文件。
【简答题】The journalist kept on (post) the latest news on the Internet to report what was going on in the incident of the air crash.
【简答题】革兰氏阳性细菌细胞壁的成份主要包括 __ __ 、 __ ____ 。