断电会使存储数据丢失的存储器是
A.RAM
B.硬盘
C.ROM
D.软盘
参考答案:A
解析:RAM即易失性存储器,一旦断电,信息就会消失。
Alice Walker's graphic depiction of the lives of Black people in the south has established her as one of the most promising contemporary writers in the states.
A.optimistic
B.humorous
C.somber
D.vivid
百分比抽样的抽样基数不得小于样本的()。`
A、3倍
B、4倍
C、5倍
D、6倍