Introduction of the selection procedure of control ball valve and butterfly valve and the empiric selection of the coefficient in calculation.

介绍了调节型球阀和蝶阀选用的步骤及计算中一些系数的经验取法。

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If he misses the shot and one his teammates is able to regain control of the ball, it is called an "offensive rebound."

VOA: special.2011.03.25

The Leeds skipper used a touch to control the ball before guiding it past the advancing Camp.

BBC: Sport - Football - Leeds 4-1 Nottm Forest

The rules of soccer prohibit players from trying to control the ball with their arms and hands.

WSJ: Soccer 'Header' Impact Likened to Hard Punch

But to the relief of the centre-back, the Stags striker failed to control the ball from two yards out.

BBC: SPORT | Football | FA Cup | Newcastle 1-0 Mansfield