From viewpoint of practice, it is sometimes important to detect abnormal happenings in the running gear by（）<br>A:a keen sense of hearing<br>B:rich theory<br>C:communicating ability with others<br>D:repetition work

From viewpoint of practice, it is sometimes important to detect abnormal happenings in the running gear by（）
A:a keen sense of hearing
B:rich theory
C:communicating ability with others
D:repetition work

出自：海船船员证

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