The whole system is controlled by a special computer system provided with back-up memory, key-board, micro-printer and led display.
专用电脑有后备存贮器、键盘、微型打印机及LED显示器。
One of the key questions is: What role does the solder alloy play in the LED package-on-board assembly reliability?
一个关键性问题：焊接合金在焊接led于线路板的可靠性中担当者什么角色？
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