2. 外语
  3. This practice book is intended for foreign engineers or students of engineering who have already mastered the elements of Englis

This practice book is intended for foreign engineers or students of engineering who have already mastered the elements of Englis

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问题    This practice book is intended for foreign engineers or students of engineering who have already mastered the elements of English, and who now want to use their knowledge of the language to read books on their own subjects. Readers should understand, however, that the purpose of the book is to teach language, not to teach engineering.
   The language in which scientific and technical words facts are expressed is certainly not a different language from that of daily life, but all the same it presents the foreign student with a number of special problems. The most obvious and the most widely recognized of these problems is the vocabulary. Much more difficult are the semi-scientific or semi-technical words which have a whole range of meanings and are frequently used idiomatically. One of the aims of this practice book is to present as many of these words as possible, and as often as possible: words such as work, paint, load, feed and force. Words like these may look harmless, but they can cause a lot of trouble for the students. But more than anything else, I have tried to describe the technical statement: that is, the completed sentence rather than the individual word. Many of the structures illustrated in this book are essential to the expression of technical facts and ideas-at least for the present.
   This practice book is aimed at  (46)  and primarily addressed to  (47)  and students engaged in engineering.
   Semi-scientific or semi-technical words are difficult to understand because they  (48)  .
   The main characteristic of the book is that the book emphasizes on the practice of  (49)  .
   Many structures illustrated in the book are essential to the expression of technical  (50)  .

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答案semi-scientific(or semi-technical)terms/words
解析 本题要求填写书本的主要特点，根据原文第2段第4句话可以得知答案是semi-scientific(or semi-technical)terms/words。
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