The correct statement of the transition attribute is（ ） A: transition-duration sets when the transition effect starts B: transition-duration sets how many seconds or milliseconds the transition effect takes C: transition-delay sets when the transition effect starts D: transition-delay sets how many seconds or milliseconds the transition effect takes

以下_________方法是在Thread类中定义? A: sleep(long milliseconds) B: wait() C: notify() D: toString()

可以使用________方法强迫一个线程等待另一个线程的结束. A: sleep(long milliseconds) B: yield() C: stop() D: join()