低层的信息系统解决()问题。
A.结构化
B.半结构化
C.非结构化
D.半结构化和非结构化
参考答案:A
Life abroad was not easy for him, and it was several years before he ________ the whole community.
A.had been familiar with
B.got familiar with
C.have been familiar with
D.would be familiar with
属于压缩机气路系统检查内容的是()
A.油泵出口压力
B.油箱液位
C.排气压力
D.冷却水压力