采用带引线的塑料芯片载体封装，外形呈正方形，32脚封装的技术叫（）
A.DIP封装
B.PLCC封装
C.QFP封装
D.PGA封装
参考答案：B
Doctors are doing research to find out what happens physically when people________smoking. [ ]
A. quit
B. decline
C. prevent
D. reserve
