?圆形继电器
... 梳形继电器 comb type relay 圆形继电器 round relay 叶片形继电器 vane-type relay ...
接力赛
圆型继电器
He reached the 400m semi-finals there and also took part in a preliminary round of the 4x400m relay.
BBC: Africa
"That still doesn't give me any motivation, " said Bolt, who is expected to be rested for the 4x100m relay first-round heats on Friday.
BBC: Bolt switches focus to relay gold
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