拉伸塑性失稳:
参考答案:
拉伸过程中发生缩颈的现象
---Why did the police_____ the crowd?
---Because the president’s car ____ in the street.
A.break down; went wrong
B.break up; out of order
C.break down; broke up
D.break up; broke down
对于需要在电信执照上体现的信息,由()审核后报()换发执照。
A.地区管理局,民航局
B.地区空管局,地区管理局
C.地区空管局,民航局
D.地区管理局,民航局空管局