下列( )不是文件系统的功能。A．文件系统实现对文件的按名存取_爱下问搜题

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问题单项选择题

下列( )不是文件系统的功能。

A．文件系统实现对文件的按名存取

B．负责实现数据的逻辑结构到物理结构的转换

C．提高磁盘的读/写速度

D．提供对文件的存取方法和对文件的操作

答案

参考答案：C

完形填空

完形填空
From Monday 1 Friday, American students usually get up at seven. Then they wash their faces and 2 . They usually have eggs, bread, fruit and a glass of milk. After breakfast, they 3 on footor by school bus. Some students ride bikes to school. They get to school 4 eightthirty. Then they put their backpacks in their lockers and 5 . Only one book, a table and a pencil to each class. In middle school, students have classes for six 6 . Their classes are usually English writing, math, history, 7 , P. E. and art. 8 students have lunch at school. They usually have meat, vegetables, fruit, bread and drink. 9 most students like pizza, hot dogs and hamburgers better. Students 10 have a short sleep. They go back to have classes after lunch until three o'clock. Then they 11 . Students usually play 12 sports or watch TV before dinner. They have dn er at six 13 . They usually have soup, meat, vegetables, rice or pasta. 14 they do their homework with their parents. Sometimes they play or talk with their parents. On Saturday they often go shopping, 15 their grandparents or go to a park with their parents. And on Sunday they go with their parents to church in the morning and have a big dinner at one o'clock in the afternoon.
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单项选择题

目前血压监护仪自动无创测压所采用的主要方法是（）

A.超声法

B.振动测定法

C.动脉张力测定法

D.Korotkoff音法

E.充气放气法