（多选题）
Which two statements are true？（）
AIt is possible for more than two threads to deadlock at once.
BThe JVM implementation guarantees that multiple threads cannot enter into a deadlocked state.
CDeadlocked threads release once their sleep（） method’s sleep duration has expired.
DDeadlocking can occur only when the wait（）， notify（）， and notifyAll（） methods are used incorrectly.
EIt is possible for a single-threaded application to deadlock if synchronized blocks are used incorrectly.
FIf a piece of code is capable of deadlocking， you cannot eliminate the possibility ofdeadlocking by insertinginvocations of Thread.yield（）.
正确答案
答案解析
略
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