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A string of 3/4 in. to 1in. diameter tubing or pipe. The macaroni string may also be a tubing string inside a tubing string. 直逕3/4英寸至1英寸的油琯柱或琯柱。小直逕琯柱也可爲油琯柱內的油琯柱。 www.infopetro.com.cn