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4.20透明件抗沖擊性能

有保護網(wǎng)罩的燈具透明件應(yīng)能承受沖擊能量為4J的沖擊試驗；無保護網(wǎng)罩的燈具透明件應(yīng)能承受沖擊能量為7J的沖擊試驗。

4.21保護網(wǎng)罩及抗沖擊性能

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