The sound clicks differ from the squeals in that______.
A. they are different in speeds of spreading
B. they are different in wave length
C. they are different in tones
D. they are different in volumes
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Which of the following is NOT true about Sasser and Netsky
A. They were created by Jaschan.
B. They are Jaschan's friends.
C. They are computer viruses.
D. They threaten computer security.
The value of dolphins in military uses is inspired by______.
A. their buzzes
B. their quacks
C. their clicks
D. their squeals
Elle a un peu de _____ avant son examen.
A. peur
B. crainte
C. fierté
D. appréhension
微机上广泛使用的Windows是______。
A. 多任务操作系统
B. 单任务操作系统
C. 实时操作系统
D. 批处理操作系统
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