由于晶体缺陷使正常的晶格发生了扭曲，造成晶格畸变。晶格畸变使得金属能量（），金属的强度、硬度和电阻减小。
A、上升
B、下降
C、不变
参考答案：A
Look at the national flags below. Which represents China?
A．
B．
C．
D．
He was buried in the ruins and had to _____. [ ]
A. be dug in
B. be dug out
C. dig out
D. dig in
