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【简答题】
根据文件的逻辑结构，文件可以分为（ ）两类。 A)字符串文件和页面文件 B)记录式文件和流式文件 C)索引文件和串联文件 D)顺序文件和索引文件
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举一反三
【简答题】体内氨的主要来源是 （ ）。
【单选题】Which of the following is NOT true according to the passage?
A.
The EEC spends one billion pounds on imported energy.
B.
At the present level of research spending, it is difficult to make any significant progress in the prevision of energy from the sun.
C.
The desired breakthrough could be obtained by the end of the next decade if investment were increased.
D.
The total yearly spending of the EEC on solar energy research amounted to almost 6 million dollars.
【单选题】Which of the following is NOT true according to the passage?
A.
The EEC spends one billion pounds on imported energy each year.
B.
At the present level of research spending it is difficult to make any significant progress in the provision of energy from the Sun.
C.
The desired breakthrough could be obtained by the end of the next decade if investment were increased.
D.
The total yearly spending of the EEC on solar energy research amounted to almost 6 million
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