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缝纫机的踏板机构是以___________为主动件的曲柄摇杆机构。
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缝纫机的踏板机构是以___________为主动件的曲柄摇杆机构。
A、曲柄
B、连杆
C、摇杆
时间:2021-09-02 13:06
关键词:
文鼎教育
乐山师范学院汽车检测与维修技术
答案解析
C
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