ball point pen refill
常見例句
- The double-tube ball-point pen consists of a penholder, two pen heads, two pen refills and two pen caps, wherein the penholder is provided with two parallel tubes;
本實(shí)用新型是由一個(gè)筆桿、兩個(gè)筆頭、兩個(gè)筆芯和兩個(gè)筆 帽組成。筆桿有兩個(gè)平行的管道；
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