题目内容

下列哪种数据交换技术传输时延最小？（）

A. 电路交换
B. 报文交换
C. 分组交换
D. ATM交换

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一个二进制数字通信系统，信息传输速率为1kbit/s，连续工作100秒后，接收到的错误比特为10个，误比特率（）。A、B、10-4 C、0.001% D、10-5

A. 10-6
B. 10-4
C. 10-5
D. 0.001%

Clerk: What can I do for you, madam?Anna: I'd like to buy a _1_.Clerk: What color are you looking for?Anna: I need something to go with my brown shirt.Clerk: Here's a pretty grey one. It is made from _2_.Anna: But it has long _3_. I'd like a short-sleeved blouse with a turtleneck. Do you have one?Clerk: How about this green one? I bet it _4_ your skirt perfectly.Anna: Um, I love it. Can I try it on?Clerk: Of course. What _5_ do you take?Anna: Thirty-four.(Anna tries it on.)Clerk: Wow, it looks good on you.Anna: Thanks. How much is it?Clerk: The _6_ price is $300, but we have a clearance sale today. I can give you 30 percent _7_. That would be $210.Anna: That's still too _8_. Can you lower the price?Clerk: How about another ten percent off? That's my rock-bottom price.Anna: That would be $180. The price sound _9_ now. I'll take it.Clerk: How are you going to pay - case, _10_, or credit card?Anna: Credit card.Clerk: May I ask you to pay for it at the cash register over there?Anna: Sure.

解释下列每组指令的功能。（1）LDR R0，[R1，#4]（2）LDR R0，[R1]，#4（3）LDMFD SP!，{R6 - R7, PC}（4）LDMFD SP!，{R6 - R7, PC}^（5）STMIA R0，{R1，R2，R3}（6）STMIB R0，{R1，R2，R3}（7）STRBR4，[R0，#4]!（8）STREQBR4，[R0，#4]!（9）BIC R0，R0，0x01（10）TST R0，#0x01

已知SP等于0x30001200，R4、R5、R6的值分别为0x127、0x138、0x149。试说明执行STMFD SP!, {R4-R6}指令后，SP、R4、R5、R6各寄存器和各存储单元的内容如何变化（按照小端存储法操作）。