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PWB samples were subjected to the solder float test per MIL-P-55110 and then the PTHs were cross—sectioned. 印制板試樣必須經(jīng)過MIL—P—55110標(biāo)準(zhǔn)浮焊試驗(yàn)，然后對(duì)金屬化孔進(jìn)行剖視。