A:Hello!May I speak to Tom, please
B:Speaking. [16]
A:This is Bill. I called you yesterday, but youwere not at home.
B:[17]I need to prepare something for my tripto Shanghai.
A:ShanghaiThat’s where the World Exposition(世博会)is being held. How lucky you are!
B:So I am. [18]
A:I, have a birthday party next Friday. Wouldyou like to come
B: [19]My plane will take off next Wednesday.
A:What a pity(遗憾)that you can’t come![20]
B:Thank you very much. Bye!
A:Bye!
A．Who’s that
B．I’d like to, but I’m afraid I can’t.
C．I’m buying something for my aunt.
D．Have a good trip!
E．I was shopping at that time.
F．Who are you
G．What did you call me for

Fe-3%Si合金(bcc结构)的点阵常数a=0.3nm，经形变后，研究其回复再结晶机制。回复退火时材料发生多边化过程，观察到三个亚晶交于O点如图所示。经蚀坑法测得三段亚晶界(OA，OB和OC，其长度均为0.2mm)的刃型位错总数为1.198×10⁴，设它们均匀分布构成亚晶界(α=120°，β=80°)。

(1)求相邻亚晶间的位向差θ；
(2)若经再结晶后这些亚晶界在原来位置转变为大角度晶界，且测得OA的晶界能为0.8J/m²，求其他两个晶界的晶界能。