十进制数90转换成无符号二进制数是______。
A．1011010 B．1101010 C．1011110 D．1011100
参考答案：A
线性表最常用的操作是存取第i个元素及其前趋的值，则采用 [1] 存储方式节省时间。
He _____ some German while he was away on a business trip in Berlin. [ ]
A. picked out
B. picked up
C. gave up
D. gave out
