vip彩票
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供应DCG—1型变温粘滞系数测定仪 一套起订磁力搅拌◆加热、四位数显控温，能使小球在室温~80℃范围内下落时通过8个光电门，精确方便。（含J0201—DM型存储式智能数字计时器）适用：物理、高教 、普教
