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【单选题】
一个磁盘有N个磁道，寻道时每移过一个磁道耗时T秒，文件相邻的数据块在磁盘上存放的位置平均相隔1 3个磁道，磁盘旋转延时平均R秒，每个存储块的传输时间为P秒，在这种情况下，传输100个数据块需要的时间是( )。A.
13T+100(R+P)
B.
100(13T+R+P)
C.
13(T+100R+P)
D.
100(13T+P)+R
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【单选题】Obesity (肥胖): the Scourge (祸害) of the Western World Obesity is rapidly becoming a new scourge of the western world, delegates agreed at the llth European Conference on the issue in Vienna Wednesday to...
A.
250,000,000
B.
1,200,000,000
C.
1,450,000,000
D.
950,000,000
【单选题】Obesity（肥胖）：the scourge（祸害）of the western world Obesity is rapidly becoming a new scourge of the western world，delegates agreed at tile 11th European Conference on the issue in Vienna Wednesday to Sat...
A.
250，000，000
B.
1，200，000，000
C.
1，450，000，000
D.
950，000，000
【单选题】下列属于尾突出体作用的是:1、增强船尾的结构强度;2、保护车叶和舵;3、减少伴流影响;4、改善航行性能
A.
①、②、③、④
B.
②、③、④
C.
①、③、④
D.
①、②、④
【单选题】Obesity : the Scourge of the Western World Obesity is rapidly becoming anew scourge of the western world, delegates agreed at the llth Eu-ropeanConference on the issue in ViennaWednesday to Saturday. ...
A.
250,000,000
B.
1,200,000,000
C.
1,450,000,000
D.
950,000,000
【单选题】In what way is obesity contagious and epidemic?
A.
Social networks let the obesity spread rapidly.
B.
Individuals have genetically determined ranges of weights.
C.
Obesity can easily spread from one to another without any physical contact.
D.
Obesity can spread rapidly and extensively by infection and affecting many individuals in an area or a population at the same time.
【单选题】Obesity Epidemic Ask anyone why there is an obesity epidemic and they will say that it's all down to eating too much and burning too few calories. That is undoubtedly true. But it's also true that we ...
A.
Y
B.
N
C.
NG
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