Many people are in the park. Some _____ under the tree, _____ are talking at thhee table. [ ]

A. are sitting, others

B. sit, others

C. are sitting, the other

D. sit, the others

DRAM是靠MOS电路中的栅极电容上的电荷来记忆信息的。为了防止数据丢失， 需定时给电容上的电荷进行补充，这是通过以一定的时间间隔将DRAM各存储单 元中的数据读出并再写入实现的，该过程称为DRAM的【 】。