Whichtwoof statementsaretrue？（）

A.Itispossibletosynchronizestaticmethods.
B.Whenathreadhasyieldedasaresultofyield（），itreleasesitslocks.
C.Whenathreadissleepingasaresultofsleep（），itreleasesitslocks.
D.TheObject.wait（）methodcanbeinvokedonlyfromasynchronizedcontext.
E.TheThread.sleep（）methodcanbeinvokedonlyfromasynchronizedcontext.
F.Whenthethreadschedulerreceivesanotify（）request，andnotifiesathread，thatthreadimmediatelyreleasesitslock.

【参考答案】

A, D