设备独立性(或无关性)是指能独立实现设备共享的一种特性。
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引入缓冲技术的主要目的是平滑数据的I/O速率。
A. 对
B. 错
(Para 1) What do college students today want desperately? Which one is not mentioned?
A. Doingsomething unusual and remarkable
B. Living a meaningful life
Changing the world
D. A life of goodness
（Para 1）Which of the following does not belong to soemthing extraordinary and remarkable?
A. instagram star
B. successful entrepreneur
C. superhero
D. a mediocre person
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