对于低速ICs,可用的标准封装载体主要有哪些?
参考答案:
双列直插DIP、针栅阵列PGA、小型封装SOP、四方扁平封装QFP、塑封无引脚芯片载体PLCC
Many girls living alone in the city are easily _____ and do wrong ______ parental control. [ ]
A. taken away; for fear of
B. taken in; for lack of
C. taken up; in search of
D. taken off; in place of
麻黄碱与肾上腺素比,其作用特点是()
A.升压作用弱、持久,易产生耐受性
B.可口服,无耐受性及中枢兴奋作用
C.作用较弱,维持时间短
D.作用较强,维持时间短
E.无耐受性,维持时间长