... double-beam cathode-ray tube 双电子束阴极射线管 double-beam crane 双梁吊车 double-beam densitometer 双光束密度计 ...
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短语
手动双梁吊车
hand-drive double beam crane
;
hand-operated two-beam crane
手动单双梁桥式吊车
hand-operated single-and-double beam bridge crane
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