... lead foil 铅箔 lead for retractable pencil 铅芯 lead gauge 螺距规 ...
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公司目前主要专业生铅芯盒和铅笔芯。
Health professionals currently lead the main box and pencil lead.
你是否像用手指把铅芯挤出来一样用力过大?
Do you grasp it too tightly, as if trying to squeeze the lead out of the case with your fingers?
开展对设置铅芯橡胶支座的大型渡槽非线性地震响应研究。
The nonlinear earthquake response of large-scale aqueduct with the lead rubber bearing is studied.
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