题目内容

文件系统中源程序是有结构的记录式文件。（）

A. 对
B. 错

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The energy problem is not merely a short-term crisis. Geologists 【1】 that 80 percent of all the oil 【2】 in the US will be used 【3】 before the year 2000. We might even come to the end of our coal reserves, abundant as they are, before another century is over. Americans have been 【4】 this situation suddenly. Many unprepared even to recognize 【5】 , and most of us are unprepared to meet it. We are unprepared 【6】 our habits and traditions, and our national life 【7】 based on a history of material abundance. With about 6 percent of the world’’s 【8】 ,we in the US 【9】 nearly 50 percent of the world’’s energy resources. Such resources within the us 【10】 are still ample by any standards except our own.

A. design
B. way
C. style
D. method

物流系统选址是指对物流网络中的关键物流节点的数量、位置、大小进行优化，以实现整个物流系统的效率最大化。

A. 对
B. 错

义务教育历史课程的具体目标可分为、、__的掌握。

在一个完善的文件系统中；可以采取多级保护设施来防止系统中的文件被非法窃取和破坏，第一是；第二是；第三是__。