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In recent years,hidden wedge sports shoes, China developed a hidden wedge sports shoes@high-purity boron powder, the@Hidden Heel Trainers surface of B2O3 and H3BO3 content is very small, direct for HTPB boron-rich fuel propellant formulations, will not only avoid the application of low-purity boron powder burn per 7170 (4) formance and energy properties.@ƒz[ƒ€
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