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六角形的螺母,一次只需要把扳手扳动60度,就能够慢慢把螺母拧紧。
Six angular nuts, one time only need the spanner to move 60 degrees, can screw tight slowly the nut.
youdao
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六角形的螺母,一次只需要把扳手扳动60度,就能够慢慢把螺母拧紧。
Six angular nuts, one time only need the spanner to move 60 degrees, can screw tight slowly the nut.
youdao