题目内容

If we continue to ignore the issue of global warming, we will almost certainly suffer the ______ effects of climatic changes worldwide.

A. dubious
B. drastic
C. trivial
D. toxic

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简单无向图的邻接矩阵是对称的，可以对其进行压缩存储。若无向图G有n个结点，其邻接矩阵为A[1..n，1..n]，且压缩存储在B[1..k]，则k的值至少为______。

A. n(n+1)/2
B. n2/2
C. (n-1)(n+1)/2
D. n(n-1)/2

传输层用于标识不同的应用的是______。

A. 物理地址
B. 端口号
C. IP地址
D. 逻辑地址

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A. expansion
B. exposure
C. expense
D. expectation

通过改变载波信号的相位值来表示数字信号1、0的方法是______。

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B. FSK
C. PSK
D. PPP