对一个将页表存放在内存中的分页系统:(1)如果访问内存需要0.2μs,则有效访问时间为多少?(2)如果加一快表,且假定在快表中找到页表项的概率高达90%,则有效访问时间又是多少(假定查快表须花费的时间为0)?
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在可变分区存储管理下,按地址排列的内存空闲区为10KB、4KB、20KB、18KB、7KB、9KB、12KB和15KB。对于下列的连续存储区的请求:①12KB、10KB、9KB,②12KB、10KB、15KB、18KB。试问:使用首次适应算法、最佳适应算法、最差适应算法和循环首次适应算法,哪个空闲区被使用?
Collocation is a key part of learning vocabulary. WHich is the incorrect collocation?
A. Do the washing
B. Make a mess
C. Make dressed
Awareness of connotation is also a key aspect when learning vocabulary. What is the appropriate connotation for the word "Lazy"
A. Positive
B. Neutral
C. Negative
Seeing new words in context is important when learning vocabulary. What does this help you identify about a word?
A. Frequency
B. Synonyms
C. Usage