题目内容
The hardness of the wheel has little influence on the speed of taxiing. In different use situations and race distances, the wheel with the same hardness should be selected
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Speed roller skates belong to
The hole spacing of 30-32 yards for speed skating is:______ The hole spacing for speed skating in 33-37 yards is:______ The hole spacing of speed skating shoes in 38-45 yards is:______
Install 4 x 90 mm wheel frame length is______ inches, pitch is ______ mm
Measure the actual______ and ______ of the foot before choosing a speed skate.
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