转炉主控室的布置,应有哪些安全要求?
参考答案:
确保在出现大喷事故时的安全,并设臵必要的防护设施;连铸主控室不应正对中间罐;转炉炉旁操作室应采取隔热防喷溅措施。
Professor Smith, together with his assistants, ________on the project day and night to meet the deadline. [ ]
A. work
B. working
C. is working
D. are working
直肠耐受剂量()。
A.6500~7000cGy
B.3500~4000cGy
C.5500~6000cGy
D.4500~5000cGy
E.7000~7600cGy