At least one of Fang Ming, Ma Liang and Dennis took part in the men's 100m competition at the International track and Field Invitational Championships held in Tokyo, Japan  And: (1) if Fang Ming participates in the men's 100m, then Ma Liang must also participate  (2) those who sign up for the men's 100m must have a urine test in advance and be examined and approved by the experts of the invitational competition before they can officially participate in the competition
(3) Dennis came to sign up after the urine test before the game
Fang Ming took part in the men's 100m race