手机某个零件图纸的比例尺是5:1,在图纸上量得零件的长度是25毫米,这个零件的实际长度是____厘米.
What was Jim's first teacher like?
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yǔ sǎn cài dāo jú huā shǒu biǎo pí qiú yī fu
____ ____ ____ ____ ____ ____