数据传送操作过程中由于磁头损坏或故障造成磁盘块上的内容丢失。这类故障属于( )。

题型:单项选择题

问题:

数据传送操作过程中由于磁头损坏或故障造成磁盘块上的内容丢失。这类故障属于( )。

A.系统故障

B.磁盘故障

C.逻辑错误

D.硬件故障

考点:计算机等级考试数据库技术国家计算机三级(数据库技术)75
题型:单项选择题

脊髓灰质炎以儿童发病率为主其原因为()。

A.疫苗和接种

B.病后有较牢固的免疫力

C.以隐性感染为主

D.儿童抵抗力差

E.病原体致病力强

题型:单项选择题

额定电压是指线电压。()

题型:单项选择题

句型转换。

1. Ling Feng is cleverer than any other students in his class. (改为同义句)

    Ling Feng is _____ _____ student in his class.

2. Our math teacher is the funniest person, I think. (对画线部分提问)

    _____ do you think _____ the funniest person?

3. Tourists need to wear warm clothes in winter. (改为一般疑问句)

    _____ tourists _____ to wear warm clothes in winter?

4. Lucy is 13 years old;Tom is 15 years old. (改为同义句)

    Tom is two years _____ _____ Lucy.

5. We did a survey of some readers. (改为否定句)

    We _____ _____ a survey of any readers.

题型:单项选择题

以连续监测法测定的酶,其监测波长为340nm的有()

A.CK

B.LD

C.ALT

D.AST

E.ALP

题型:单项选择题

交流市电电源标称电压为380V时,通常情况下UPS输入端电压变动允许范围为()V。

A、332—408

B、323—418

C、320—410

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