罂粟女孩
Nailhead weakness and to deviation(drill a hole and electroplate behind) Manufacturing process elucidation Drill a hole quality to really recognize\\ Work contents Generally after drilling a hole,the position had to confirm to drill a hole is fitting,do not leak to drill,drill to be partial to,the bore breaks or the inner part tear to pieces of weakness.So the industry often uses of check equipments,see through to equip check machine only for the X,drill a hole circuit board position to do sampling to check with this,by drilling a hole by confirmation of district have no exceed the scope limited by copper mat.Then have to confirm and don't lead to tear to pieces phenomenon stuffily at quality aspect inside the bore,the phenomenon there been copper scraps and resin to tear to pieces,then will present so-called"nailhead type weakness" after electroplating,leading the big nailhead will become the problem of[with] quality trust of the circuit board of future,so most products will grow weakness to make a specification definition to the time.
lulu酱求好运
个位ones place
十位tens place
百位hundreds place
千位thousands place
个位数ones，十位数tens，百位数hundreds，千位数thousands
扩展资料：
基数词变化规律如下所示：
1、1至10无规律可循： one、two、three、four、five、six、seven、eight、nine、ten；
2、11至19 ：eleven、twelve、thirteen、fourteen、fifteen、sixteen、seventeen、eighteen、 nineteen；
3、从20至99：整数的几十中除了twenty（二十）、thirty（三十）、forty（四十）、fifty（五十）、eighty（八十）为特殊形式外，sixty（六十）、seventy（七十）、ninety（九十）都是其个位数形式后添加后缀-ty构成。
4、百位数个数基数词形式加“hundred”，表示几百，在几十几与百位间加上and。
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