他不得不用力推挤针管，这个过程非常慢。
He has to push down hard on the plunger, and the process is slow.
是否有断针管理规定？
本产品由保护套、针管、针座、和注射器组成。
Product structure: The product consists of protective cover, needle tube, needle seat and syringe.
产品结构：本产品由保护套、针管、针座、和注射器组成。
Product structure: The product consists of protective cover, needle tube, needle seat and...
产品结构：本产品由保护套、针管、针座、和注射器组成。
Product structure: The product consists of protective cover, needle tube, needle seat and...
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