问题 问答题 简答题

光面爆破和预裂爆破的主要区别?

答案

参考答案:

(1)炮孔起爆顺序不同,光面爆破是主爆区先爆,光爆孔后爆;预裂爆破是预裂孔先爆,主爆区后爆;

(2)自由面数目不同,光面爆破有两个自由面,预裂爆破只有一个自由面;

(3)单位炸药消耗量不同,光面爆破单位炸药消耗量小,预裂爆破由于药包受到的夹制作用较大,故炸药单耗也大。

单项选择题
填空题

[A] As a science, management entails the use of organized knowledge. Many of the things managers do are a result of information obtained through formal research and study. One area in which a great deal has been done is quantitative decision making or, as it is known today, management science. We know that by using certain mathematical formulas we can control inventory and project demand more accurately than by merely using trial and error.

[B] Management is the process of getting things done through people. We know that part of this process is carried out with the development of an organization structure.

[C] Yet management is also an art. Through experience the manager develops judgment and intuition, subjective factors that are useful in evaluation situations. For example, the manager may have to choose between two strategies, A and B. All research and study may indicate that neither of the two is any better than the other.

[D] Effective management is a combination of art and science. Neither should be ignored; neither ought to be relied on exclusively. In getting things done through people, management must seek the right blend of art and science. At the upper levels of the hierarchy there will be more emphasis on the former; at the lower levels there will be more emphasis on the latter.

[E] How do managers succeed in getting things done through people In order to answer this question it is necessary to break down the manager’ s job into its basic duties or functions. Management entails planning, organizing, directing, and controlling. By performing well in each of these areas the manager can get things done through people.

[F] However, what if the manager chooses strategy A on the basis of intuition and proves to be right In this case it is difficult to say precisely why the manager was able to choose so well, but there must be some special ability he or she has. This same type of ability is useful in managing people. Effective managers know when to flatter their subordinates and when to be stern. Such human behavior skills cannot be quantified; they can only be learned through experience and training.

[G] However, there is more to management than just organizing the people and the work. Objectives must be set, plans formulated, people directed, and operations controlled. In making the necessary decisions, management must rely on all the skills at its command. As a result, management is both a science and an art.

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