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Control type: normally closed, normally open, double acting.
控制形式：标准常闭、常开、双作用。
youdao
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The double-acting variable-vane pump is a new type of variable pump.
双作用式变量叶片泵是一种新型变量泵。
youdao
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The double-acting variable-vane pump is a new type of variable pump.
双作用式变量叶片泵是一种新型变量泵。
youdao