假设1Km长的CSMA/CD网络的数据率是1Gbps,设信号在网络上的传播速率是200000km/s,求能偶使用此协议的最短有效帧长是多少?
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1. Nowadays consumers become more and more practical and buy only _______ they need.
A. where
B. which
C. when
D. what
2. She’d like to offer money to ________ needs it to continue his or her study.
A. who
B. whom
C. whoever
D. whomever
6. After three days’ waiting, there was a little doubt in the mother’s mind _______ the police could find her lost child.
A. how
B. that
C. where
D. whether
7. “Sustainable development” is a question _______ we can continue developing the world without damaging the environment.
A. why
B. when
C. that
D. how