某地区1990-1996年排列的每年年终人口数动态数列是()
A、绝对数动态数列
B、绝对数时点数列
C、相对数动态数列
D、平均数动态数列
参考答案:B
Kate met a lot of problems _____ she was going over her lessons. [ ]
A. before
B. as soon as
C. until
D. while
单纯疱疹由单纯疱疹病毒引起的,人类单纯疱疹病毒1型主要引起生殖器部位的皮肤黏膜以及新生儿的感染。