— Is it a hall? — _____________ [ ]
A. Yes, it is.
B. No, it isn't.
答案:B
罐区氯乙烯球罐的最大充装容积≤()
机件在交变应力作用下的损坏叫()
A、疲劳破坏
B、弯曲破坏
C、应变破坏