【名词&注释】
含氧量(oxygen content)、燃烧器(burner)、止血带(tourniquet)、工作条件(working condition)、轮机长(chief engineer)、方便快捷
[单选题]Which of the following is NOT a recommended safe practice?
A. Securing equipment against slipping or drifting
B. Operating machinery at its recommended speed
C. Repairing loose handles on tools before using
D. Using tools for purposes for which they are not designed