[填空题]
A radio voice signal from the Apollo crew on the Moonaiyd cu6 k;2qsc3.4xv (Fig. Be9euab m;74a rhlow) was beamed to a listening crowd from a radio speaker. If you were standing 25 m from the loudspeaker, what was the total time lag between when you heard the sound and when the soune74;9uarhb ma d left the Moon? s
