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质量标准的分类（）
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Calligraphy（书法） is the essence of Chinese culture. It can be seen everywhere in China and is closely linked to daily life. A Calligraphic work is usually a poem, a pair of couplets or a motto the owner likes very much. Calligraphic works can decorate sitting rooms, studies and bedrooms and bring pleasure to guests and friends.
采用齿轮齿条侧向抽芯机构的侧抽芯可以获得较长的抽芯距和较大的抽芯力。（ ）
手动侧向分型与抽芯机构分为两大类，一类是（ ）抽芯，一类是（ ）抽芯。
在侧向分型与抽芯机构中，液压侧抽芯机构（ ）。
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