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School Physical and Chemical Students Teaching Experimental Instruments Electric Bead Small Bulbs Various Specifications Complete in stock Straight Hair
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Teacher's version of the magnetic attraction type electrical demonstration box large ammeter can absorb the blackboard junior high school physics experiment switch lamp holder
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5.0
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Screw lamp bead base for physics experiment Small bulb Small ball 1.5 2.5 3.8V bulb E10 lamp holder
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4.0
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