现代计算机硬件系统的性能发展瓶颈是（ ）。

单项选择题（ ）是网络的心脏，它提供了网络最基本的核心功能，如网络文件系统、存储器的管理和调度等。

单项选择题A: Thank you for looking after the eat for me.B: (). I love cats.

A. Thank you
B. It’s my pleasure
C. By the way
D. No, of course not
E. Never mind

单项选择题A．This tour is the chance of lifetime．B．It goes all over North America and South America．C．It looks like you’re dreaming about something．D．You’ll have to quit school and your job at the store．E．My agent wants me to go on a tour with Art’s Jazz Band．F．Have you told anyone about this yetG．It would be a great opportunity!

单项选择题通常，计算机是计算机系统的简称，从系统的角度看，它应包括（ ）。

单项选择题A．This tour is the chance of lifetime．B．It goes all over North America and South America．C．It looks like you’re dreaming about something．D．You’ll have to quit school and your job at the store．E．My agent wants me to go on a tour with Art’s Jazz Band．F．Have you told anyone about this yetG．It would be a great opportunity!

单项选择题A. What a beautiful dress!B: (). I just got it yesterday.

A. Thank you
B. It’s my pleasure
C. By the way
D. No, of course not
E. Never mind

单项选择题A: Would you sign the register please, SirB: Sure.() ,does my morn have a private bathA: Certainly. Every room in this hotel has a private bath.

A. Thank you
B. It’s my pleasure
C. By the way
D. No, of course not
E. Never mind

单项选择题A．This tour is the chance of lifetime．B．It goes all over North America and South America．C．It looks like you’re dreaming about something．D．You’ll have to quit school and your job at the store．E．My agent wants me to go on a tour with Art’s Jazz Band．F．Have you told anyone about this yetG．It would be a great opportunity!

单项选择题最初的电子计算机采用的主要逻辑部件是（ ）。

单项选择题赵老师从因特网上找到了一份对自己有用的文字材料，他用复制、粘贴命令把它放到Word中，发现里面有大量的无用空格，他打算把这些空格全部去掉，下列方法中最适当的是（ ）。