Studies have shown that singing and dancing can be an instant, positive mood booster.
研究表明唱歌和跳舞能够马上促进积极的心情。
A positive suction pressure on the main pumps usually is needed and is frequently supplied by booster pumps close to the tanks.
输油主泵常要求正的吸入压力，并常由靠近储罐的给油泵(也称喂油泵)提供。
A positive suction pressure on the main pumps usually is needed and is frequently supplied by booster pumps close to the tanks.
输油主泵常要求正的吸入压力，并常由靠近储罐的给油泵(也称喂油泵)提供。
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