A PC is powered on and begins POST. The PC takes a long time

Ⅰ型遗传性PC缺陷症是指

A、PC:A(活性)下降，PC:Ag(抗原)正常

B、PC:A(活性)下降，PC:Ag(抗原)下降

C、PC:A(活性)正常，PC:Ag(抗原)正常

D、PC:A(活性)正常，PC:Ag(抗原)下降

E、PC:A(活性)下降，PC:Ag(抗原)增加

8255A的端口A工作在方式2时，如果端口B工作在方式1，则固定用作端口B的联络信号的端口的信号是( )。

A．PC2～PC0

B．PC2～PC4

C．PC7～PC5

D．PC3～PC1

As long as it takes enough time and endeavor for the candidates to prepare for the questions, their interview will go smoothly as what is expected.()

A PC is powered on and begins POST. The PC takes a long time when scanning for drives. The BIOS reports no hard drive can be found but the CD-ROM is identified. The technician knows that there are two hard drives on the primary EIDE controller and a CD-ROM on the secondary EIDE controller.Which of the following is the MOST likely cause of the problem?（）

A. Both hard drives have the master jumper in place.

B. One hard drive is set as master and the other slave.

C. The hard drive data cable is reversed.

D. Both hard drives have the cable select jumper in place.

根据PC系列微机总线标准的兼容性，( )是正确的。

A．PC/XT 机的插卡可在AT总线(ISA总线)的PC机上使用

B．PC/AT 机的插卡可在PC/XT 总线的PC机上使用

C．PC/XT 机的插卡可在MCA 总线的PC 机上使用

D．PC/AT机的插卡可在MCA总线的PC机上使用

A、It takes a long time to reach LA.

B、Usually it takes around 12 days.

C、LA is very far from here.

当8255A工作在方式1时，端口C被分为两个部分，分别作为端口A和端口B的控制信息与状态信息。这两个部分的划分是( )。

A．端口C的高4位(PC7～PC4)和低4位(PC3～PC0)

B．端口C的高5位(PC7～PC3)和低3位(PC2～PC0)

C．端口C的高3位(PC7～PC5)和低5位(PC4～PC0)

D．端口C的高6位(PC7～PC2)和低2位(PC1～PC0)

胎儿肺成熟PC/S比值应达到

A、PC/S≥2.0

B、PC／S2.0

D、PC/S1.5～1.9

E、PC／S<1.9

A. The memory is failing.

B. The CPU is overheating.

C. The hard drive is not attached properly.

D. The operating system is not installed.

芯片8255A的端口B工作在方式1输出时，端口C中被用作端口B的应答信号的是

A.PC3、PC4、PC5

B.PC0、PC1、PC2

C.PC2、PC3、PC4

D.PC4、PC5、PC6