题目内容

Install 4 x 90 mm wheel frame length is inches, pitch is mm

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Measure the actual and of the foot before choosing a speed skate.

When measuring foot length, find out a piece of white paper, tiled on the ground, then use a foot to draw out the outline of the whole foot with a pen, the length and width of the smooth outline can be measured with the hand finally

Speed roller skates are athletic shoes, not equipment

The inline speed skating competition can be divided into track and road race. The road race track can be open or closed. The perimeter of the track is （） meters

A. 150
B. 200
C. 300
D. 400