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Preparation of hydrogen, carbon dioxide, oxygen device set, simple gas porous partition, junior high school chemistry experimental equipment

Absorbent cotton/cotton ball 500g large bag absorbent cotton roll tattoo embroidery cotton sheet can be used for cotton ball Laboratory

Three-ball instrument solar eclipse total eclipse principle Sun, Earth, Moon astronomical fun popular science instrument Chinese English version direct supply

Junior High School optical experiment box parallel light source physical optical instrument suit convex lens concave lens triangular prism

Longwei AC millivolt meter TVT322 double needle millivolt meter dual channel cross-border hot sale

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Hydrogen fuel cell experimental device water electrolysis experimental device electrolyzed water to produce hydrogen oxygen PEM proton membrane

Resistance Coil 5Ω10Ω15Ω Ohm Fixed Value Resistor J23018 Electrical Experiment Measurement Resistor Three-Piece Set

Manufacturers supply junior high school students power J04001 teaching equipment welcome to buy

26033 dialysis Laboratory High School chemical separation and purification semi-permeable membrane experimental demonstration instrument teaching instrument

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Micro-current amplifier 15032 adjustable multiple junior and senior high school physics electrical experiment equipment teaching aids instrument

Optical parallel lens suit 7-piece concave-convex lens vision correction demonstrator can be equipped with three-line light source

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Three-SPHERE instrument Sun Moon Earth three-sphere movement instrument total solar eclipse public rotation lunar phase demonstration model geographic instrument

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The specific heat of the calorimeter object, the electric heat equivalent, the experimental measurement of physics in junior high school and senior high school, the thermal teaching aid instrument.

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11001 physical balance mechanical balance physical mechanics teaching instrument experimental equipment lever type equal arm

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Induction Box Biological Inoculation Box Uv Lamp Germicidal Box 27005 Biological Experimental Instrument Teaching Instrument

Bronco Regular Measuring Instrument Procker Normally Measuring Instrument Teaching Instrument High School Physics Experimental Equipment

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Root longitudinal section model J33202 junior and senior high school biological botany teaching instrument experimental equipment corn root tip

Object conductivity experiment box primary school science teaching instruments and equipment verify the conductivity of different materials