Before any machinery is put in operation,you should().

A . ventilate all compartments,see that the machinery is clean and there are no obstructions B . just turn the key and start up C . take for granted that there are no fuel leaks D . assume there are no volatile fumes in the engine space

时间:2022-10-29 00:29:27 所属题库:杜邦公司危化品安全基础知识竞赛题库

相似题目