The service ball landing point is very important in badminton doubles.
在羽毛球双打比赛中发球点有相当重要的位置。
Porduct: Solenoid Valve, Expansion Valve, Ball Valve, Service Valve, Drain Pump.
主营产品：电磁阀，膨胀阀，球阀，截止阀，排水泵。
Many NIBCO ball valves are available for oxygen service.
许多美国尼伯科球阀都可用于氧气应用。
The service ball landing point is the key skill in serving the ball in doubles.
而发球落点的变化性是高水平双打选手发球技术的重要标志。
Main features: ball bearing, flexible switch, no noise, long service.
主要特点：滚珠轴承，开关灵活，无噪音，寿命长。
Main features: ball bearing, flexible switch, no noise, long service life.
主要特点：滚珠轴承，开关灵活，无噪音，寿命长。
Main features: ball bearing, flexible switch, no noise, long service life.
主要特点：滚珠轴承，开关灵活，无噪音，寿命长。
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