某患者由于使用化妆品引起面部水肿、渗出、痒痛,应属于
A. Ⅰ型变态反应
B. Ⅱ型变态反应
C. Ⅲ型变态反应
D. Ⅳ型变态反应
E. 以上都不是
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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
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
Many manufacturers were accused of concentrating too heavily on cost reduction, often at the ______ of the quality of their products.
A. expansion
B. exposure
C. expense
D. expectation