A. 搜集信息 B. 存储信息 C. 处理信息 D. 检索信息
A. 六个月 B. 一年 C. 一年半 D. 两年
A. 正确 B. 错误
A. so as to never be integral lube B. with a sloped bottom C. only of nonferrous, noncorrosive metals D. with drain/return lines terminating just above or at the designed normal level