Control type: normally closed, normally open, double acting.
控制形式：标准常闭、常开、双作用。
several companies acting together to control production, pricing, and distribution of a product.
几家公司联合行动以控制一种新产品的生产、定价和销售。
several companies acting together to control production, pricing, and distribution of a product.
几家公司联合行动以控制一种新产品的生产、定价和销售。
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