几无中枢抑制作用的H1受体阻断药是
A. 氯苯那敏
B. 苯海拉明
C. 氯马斯汀
D. 阿司咪唑
E. 曲吡那敏
In spite of the heavy snow and hard rain, the buses still ran on. ______.
A. list
B. plan
C. arrangement
D. schedule
Does Tom know any other foreign languages () English
A. but
B. except
C. besides
D. beside
一个含有n个顶点和e条边的简单无向图,在其邻接矩阵存储结构中零元素的个数是______。
A. e
B. 2e
C. n2-e
D. n2-2e