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【单选题】
下列四种说法中哪个是疲劳破坏的主要特征？A.
疲劳破坏要经历三个阶段所以破坏前有明显的塑性变形。
B.
金属结构承受的交变应力接近材料的强度极限时才可能导致结构的疲劳破坏。
C.
塑性好的金属材料疲劳破坏前有明显的塑性变形；脆性材料则不会有明显的塑性变形。
D.
疲劳破坏是一个损伤累积的过程，从疲劳断口可以看到：疲劳源、裂纹稳定扩展区、快速断裂区。
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】关于肾柱肥大的说法,哪项是错误的( )
A.
肾窦回声的外侧或后部出现低回声区,连续扫查,其形态不呈球形
B.
低回声区处肾表面不隆起
C.
低回声区与肾皮质间有明显分界
D.
低回声区的大小不超过3cm
E.
彩色血流图不能发现异常
【单选题】Which process is the most suitable to volume produce the bottle caps?
A.
Presswork
B.
Die-casting
C.
Welding
D.
Milling
【单选题】—Which of the caps will you take? —I'll take________,one for my father,the other for my brother. [ ]
A.
neither
B.
Both
C.
all
D.
none
【单选题】Which process is the most suitable to volume produce the bottle caps?
A.
Milling
B.
Presswork
C.
Die-casting
D.
Welding
【单选题】— Which of the caps will you take? —I’ll take______ , one for my father, the other for my mother.
A.
neither
B.
both
C.
all
D.
either
【单选题】-Which of the caps will you take?
A.
'll take____,one for my father, the other for my brother.
B.
neither
C.
both
D.
all
E.
Either
【单选题】-Which of the caps will you take?-I'll take _________,one is for my father, the other for my brother. [ ]
A.
neither
B.
both
C.
all
D.
too
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