分片到货的静置设备，在现场组装时，常用的方法为（）。
A．水浮法
B．倒装法
C．气顶法
D．环带法
参考答案：B
从传声器输出端测得的交流阻抗定义为传声器的______。
The peopleall over the world were deeply____by the news that SteveJobs, the founder and former
CEO of Apple, died on Oct.5. [ ]
A. effected
B. attacked
C. affected
D. attained
