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aa / AA and AAA Battery Charger

aa
aa

sometimes porters cannot lift the box because its weight while they cannot reach the bottom of it as well .A groove is designed to solve the problem 。By using an origin of force , porters can move the box easier than that don't have.

University

Fuzhou university

Fuzhou university
xiamen, China

kang huaji,
Fuzhou university

University

Fuzhou university

Fuzhou university
xiamen, China

kang huaji,
Fuzhou university