【名词&注释】
心理因素分析(the factor analysis of psychology)、轮机长(chief engineer)、充分认识(fully realize)
[单选题]The FIRST thing to do to ensure that a refrigeration unit will not start while undergoing repairs, is to _____.
A. secure and tag the electrical circuit
B. place a crow bar in the flywheel of the unit
C. inform. all persons in the area not to start the unit
D. make a log book entry
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