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The FIRST thing to do to ensure that a r
题目内容:
[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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