He was too excited _________. [ ]
A. speak
B. to speak
C. not to speak
D. speaking
答案:B
当声源波长与声源尺寸相比()时,可以将该声源视为点声源。
A.差不多
B.较小
C.较大
D.大得多
一个具体的线程是由______、代码和数据组成。