... 伸长杆 extension rod 增设装置，电话分机 extension set 伸长杆 extension stem ...
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... 延伸心轴 extended spindle 伸长杆 extender 接长电线 extending cord ...
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如果铸造空心铸件时模型上包含伸长杆便于在砂中放置砂芯的空间称为型芯座。
If a hollow casting is to be made the pattern will include extension pieces so that Spaces to accept the sand core are molded into the sand. These additional Spaces in the mold are termed core prints.
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