【名词&注释】
操作系统(operating system)、汇编语言(assembly language)、可执行(executable)、联想输入法、五笔字型码
[单选题]在Linux操作系统中，命令"chmod-777/home/abc"的作用是____.
A. 把所有的文件拷贝到公共目录abc中
B. 修改abc目录的访问权限为可读、可写、可执行
C. 设置用户的初始目录为/home/abc
D. 修改abc目录的访问权限为对所有用户只读
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举一反三：
[单选题]C is sometimes referred to as a 'high -level(66)language'. Some people think that's an insult, but it's actually a deliberate and significant aspect of the language. If you have(67)in assembly language, youll probably find C very natural and comfortable(although if you continue to focus too heavily on machine - level details, youll probably end up with unnecessarily non- portable programs). If you havent programmed in assembly language, you may be frustrated by C 's lack of certain higher - level features. In either case, you should understand why C was de- signed this way: so that seemingly - simple constructions expressed in C would not expand to arbitrarily expensive( in time or(68))machine language constructions when(69). If you write a C program simply and succinctly, it is likely to result in a succinct, efficient machine language executable. If you find that the(70)resulting from a C program is not efficient, it's probably because of something silly you did, not because of something the compiler did behind your back which you have no control over. In any case, there's no point in complaining about C's low - level flavor: C is what it is.
A. assembly
B. combination
C. grouping
D. compounding
[单选题]五笔字型码输入法属于(35)。
A. 音码输入法
B. 形码输入法
C. 联想输入法
D. 音形结合输入法
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