Which of the listed precautions should be taken when cleaning the internals of a motor with compressed air?（）<br>A:Open the machine on both ends so as to allow the air and dust to escape<br>B:Be certain that the circuit breaker is opened and tagged on the feeder panel<br>C:Be certain that the air is clean and as dry as possible<br>D:All of the above

Which of the listed precautions should be taken when cleaning the internals of a motor with compressed air?（）
A:Open the machine on both ends so as to allow the air and dust to escape
B:Be certain that the circuit breaker is opened and tagged on the feeder panel
C:Be certain that the air is clean and as dry as possible
D:All of the above

出自：海船船员证

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