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【简答题】
有一个交叉存放信息的磁盘,信息在其上的存放方法如图 6-A 所示。每磁道有 8 个扇区,每扇区 512 字节,旋转速度为 3000 转 / 分。假定磁头已在要读取信息的磁道上, 0 扇区旋转到磁头下需要 1/2 转,且设备对应的控制器不能同时进行输入 / 输出,在数据从控制器传送到内存这段时间内,从磁头下通过的扇区数为 2 ,问依次读出一个磁道上所有扇区需要多少时间( 1 ) S ?读出整个磁道的数据传输速度为 (2)KB/S ?
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举一反三
【单选题】Once people wore garlic around their necks to ward off disease. Today, most Americans would scoff at the idea of wearing a necklace of garlic cloves to enhance their well-being.However,you might find ...
A.
more and more Americans are demanding alternative therapies.
B.
healthcare insurance companies are now providing some benefits for alternative medical treatments.
C.
they are frustrated by the time constraints of managed care.
D.
scientific studies are becoming available that prove their effectiveness and safety.
【单选题】荧光鉴别采用365nm波长的紫外灯时,写为
A.
365nm紫外观察
B.
UV(365nm)
C.
365nm(UV)
D.
置紫外灯(365nm)下观察
E.
置365nm紫外灯下观察
【简答题】All of the following are mentionedas alternative treatments EXCEPT ______.A. acupuncture and herbal supplements B. massage and chiropractic therapy C. minerals and vitamin supplements D. meditation, T...
【多选题】What are the treatments of TCM?
A.
Herbal Medicaine
B.
Acupuncture
C.
Qigong
D.
massage
【单选题】单项选择。 I ______ a red apple. My sister a big pear. [ ]
A.
have, have
B.
has, has
C.
have, has
D.
has, have
【单选题】All of the following are mentioned as alternative treatments EXCEPT ______.
A.
acupuncture and herbal supplements
B.
massage and chiropractic therapy
C.
minerals and vitamin supplements
D.
meditation, Tai Chi and Qigong
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