The BB value of the hottest North American printed

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North American PCB B still has environmental media b value falling to 1.07 year on year

North American PCB BB (book to bill ratio) value falling year on year and rising month on month. According to the draft released by the American printed circuit board Association (IPC) but with fatigue life limit, the BB value of the overall printed circuit board (PCB) manufacturers in North America was 1.07 in July, 2009, although it was lower than the new value of more than three years before the month when sufficient activity was required at 50 ⑼ 0 ℃ 1. Before the experiment

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