试题与答案

铵梯炸药中木粉的作用？

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题型：问答题 简答题

题目：

铵梯炸药中木粉的作用？

答案：

参考答案：

作用是阻止硝酸铵发生结块，作疏松剂。

考点：采矿工程师采场地质与爆破采场地质与爆破题库
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题型：单项选择题


Directions: There are 10 blanks in the following passage. For each numbered blank, there are 4 choices marked A, B, C and D.

The United States is well-known for its network of major highways designed to help a driver get from one place to another in the shortest possible time. (51) these wide modern roads are generally smooth and well maintained, with (52) sharp curves and many straight sections, a direct route is not always the most (53) one. Large highways often pass by scenic areas and interesting small towns. Furthermore, these highways generally (54) large urban centers which means that they become crowded with heavy traffic during rush hours, (55) the "fast, direct" way becomes a very slow route.
However, there is almost always another route to take (56) you are not in a hurry. Not far from the (57) new "super highways", there are often older, less heavily traveled roads which go through the countryside. (58) of these are good two-lane roads; others are uneven roads curling through the country. These secondary routes may go up steep slopes, along high cliffs, or down frightening hillsides to towns (59) in deep valleys. Through these less direct routes, longer and slower, they generally go to place where the air is clean and the scenery is beautiful, and the driver may have a (60) to get a fresh, clean view of the world.

A．lead

B．connect

C．collect

D．communicate
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