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【多选题】
(1704-91)关于线程同步的描述正确的是( )。
A.
通过线程同步，保证在某个时刻只有一个线程访问同步的内容。
B.
通过线程同步，实现了线。
C.
Java提供了三种线程同步机制：同步方法，同步代码块，同步锁
D.
同步锁的效率要远远低于synchronized关键字的效率。
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