Through using the method of theoretical analysis, observation and interview, this paper made comprehensive discussion on basic technique and tactics of receive a service of tennis.
Methods The forest ecosystem service is evaluated by the method of material valuation, the ARCVIEW geographic information system technique, and the observation on the spot in the different regions.
Capt. Frank Luke, famed World War I ace of the 27th Aero Squadron, wore a leather coat and helmet over his service dress uniform when he went hunting German observation balloons.