单选题From viewpoint of practice, it is sometimes important to detect abnormal happenings in the running gear by（）Aa keen sense of hearingBrich theoryCcommunicating ability with othersDrepetition work
单选题
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
参考解析
解析：
暂无解析
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