题目内容

钢材受外力而变形，当外力去除后，不能恢复原来的形状的变形称为（）。

A. 弹性变形
B. 塑性变形
C. 钢性
D. 永久性变形

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Which two of statements are true？（）

A. It is possible to synchronize static methods.
B. When a thread has yielded as a result of yield（）， it releases its locks.
C. When a thread is sleeping as a result of sleep（）， it releases its locks.
D. The Object.wait（） method can be invoked only from a synchronized context.
E. The Thread.sleep（） method can be invoked only from a synchronized context.
F. When the thread scheduler receives a notify（） request， and notifies a thread， that thread immediately releases its lock.

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