《SMT工程》试卷(一)一、单项选择题(50题,每题1分,共50分;每题的备选答案中,只有一个最符合题意,请将其编号填涂在答题卡的相应方格)() :()+37Pb +37Pb +63Pb +:() :() ,业界中新门一种SMD,为“密封式无脚芯片载体”,常以() :,其先后顺序为:()->b->d->c ->a->c->d ->a->b->c ->d->b->:()(电阻) (电容) (二极管):() :() +37Pb之共晶点为:()℃ ℃ ℃ ℃:()+助焊剂 +助焊剂+稀释剂 +:()=IR =VR =IV %其符号表示:() :()=,W= =,W= =,L= =,L=,208PIN之ICIC脚距:() :(),7寸 ,7寸 ,8寸 ,:() ,其材质为:() :() :()±3℃ ±3℃ ±3℃ ±3℃:() :(),RMA,RN,RA ,RA,RSA,RMA ,RSA,R,RR ,RMA,RSA,:() :() :()
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