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我国电力机车控制电路电压为交流 220V。A.
正确
B.
错误
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【简答题】真核生物RNA聚合酶Ⅱ催化______合成，RNA聚合酶Ⅲ的转录产物是______和______。
【单选题】The wet volcanic ash that covered a Maya village in Central America in about AD 595 coated and pre- served everyday objects beans, chilies, rope, gourds, even unwashed dishes -- just as they had been ...
A.
Ceren at that time enjoyed a high civilization
B.
people in Ceren were more intelligent than people today
C.
Ceren' s disappearance was a tragedy
D.
the power of nature was great
【单选题】根据程序局部性理论，Denning提出了工作集理论。工作集是进程运行时被频繁访问的页面集合。在进程运行时，如果它的工作页面都在(35)内，能够使进程有效地运行，否则会出现频繁的页面调入/调出现象。假设窗口尺寸为10，在某一段时间内，进程所访问的逻辑页面顺序如图2-2所示，那么在t1时刻的工作集是(36)。
A.
外部存储器
B.
主存储器
C.
辅助存储器
D.
虚拟存储器
【简答题】完形填空。 The morning in London was wet, wet, wet. I had to check out from the 1 before noon, and then I would have a few 2 before my conference started near Richmond Park in the 3 . I started early for a...
【单选题】She __ the wet clothes on the grass to dry them in the sum.
A.
spread
B.
scattered
C.
dispersed
D.
distributed
【单选题】根据程序局部性理论，Denning提出了工作集理论。工作集是进程运行时被频繁访问的页面集合。在进程运行时，如果它的工作页面都在(4)器内，能够使进程有效地运行，否则会出现频繁的页面调入/调出现象。 假设窗口尺寸为10，在某一段时间内，进程所访问的逻辑页面顺序如图1-2所示，那么在t1时刻的工作集是(5)。
A.
外部存储
B.
主存储
C.
辅助存储
D.
虚拟存储
【单选题】The wet volcanic ash that covered a Maya village in Central America in about AD 595 coated and preserved everyday objects beans, chilies, rope, gourds, even unwashed dishes—just as they had been left,...
A.
Ceren at that time enjoyed a high civilization
B.
People in Ceren were more intelligent than people today
C.
Ceren's disappearance was a tragedy
D.
the power of nature was great
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