搜题请搜索小程序“爱下问搜题”
问题 单项选择题

关于8250的内部寄存器说法错误的是()。

A．8250有10个内部寄存器，分成三组

B．第一组用于实现数据传送，包括发送保持寄存器、接收缓冲寄存器和中断允许寄 存器

C．第二组用于工作方式、通信参数的设定，包括通信控制寄存器等

D．第三组称为状态寄存器，包括通信状态寄存器等

答案

参考答案：B

解析：选项B中的中断允许寄存器应该属于8250的第二组内部寄存器。

阅读理解

                                  SUNSHINE COMPANY
Products for a Safe Environment
A4277—HAND SOAP
You are going to love this natural soap. There are no chemicals in it. It is very good for your hands and face.
D4545—GARDEN SPRAY
Insects are going to run away from our new chili garlic spray. It is safe and natural.
B2377—HOME CLEANER
You are not going to need 5 or 6 chemical cleaners. You have Dr Clean! It is safe and strong, and it cleans everything in your house!
A2104—CANVAS BAG
You are going to say, “ No paper or plastic!” You have this excellent heavy canvas shopping bag.
 

Item
Code
Price
Natural shampoo
T6762
$3.00
Garden spray
D4545
$2.50
Canvas bag
A2104
$4.00
Hand soap
A4277
$1.00
Home cleaner
B2377
$2.25
Postage: $3.50
50. Dr clean is _______.
A. an expert in cleaning everything                    B. a newly—invented machine
C. a can of cleaning powder                       D. a magic cloth for cleaning
51.According to the ads, where can you mail your letter to if you want something to kill ants?
A. D4545 Garden Spray                             B. Sunshine Company
C. Safe Environment Product                            D. The Dr Clean’s
52.According to the ads. How much do you have to pay for three shampoos and two canvas bags 
totally?
A. $ 12.25                           B. $ 20.50                    C. $ 13.50                    D. $ 17.00
查看答案
单项选择题

为下列情事，海关依法收取担保资金中，属于风险担保金的是______。

A．对正在办理减免税审批手续，急需提货而收取的担保资金
B．对缉私、稽查查获的执行风险较大的追征税款情事收取的担保资金
C．对进境修理和出境加工的货物收取的担保资金
D．从事转关运输的企业而收取的担保资金
查看答案