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The referee may interrupt the match, terminate the match, rematch or cancel the match if there is any emergency on the spot that affects the progress of the match

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Pairs is when a man and a woman or two men and two women perform their movements in unison, skating in coordination with each other

The toe of the current mainstream speed roller skates is divided into two types:（）

A. Round and flat
B. pointed and square
C. Square and round
D. Pointe and round

The machining precision of the wheel frame is not enough, which causes the deformation of the frame after the wheel is installed tightly and causes （）

A. the wheel not to turn
B. Wheel deflection
C. Wheel swing
D. Wheel fracture

Generally speaking, the wheel with the hardness of is hard and suitable for long distance; the wheel with the hardness of is moderate and suitable for various distances; the wheel with the hardness of __ is soft and suitable for short distance