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露天矿台阶高度决定了孔深,而孔深不受钻孔直径的制约,当孔径确定以后,合理的孔深不可以提高钻孔和装药效率,因此台阶高度与钻孔直径没关系。()

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&8226;you are an Assistant Sales Manager who has just handle the enquiry that Mr. Lin, Regional Sales Manager passed to you on Friday.
&8226;Write a memo to Mr. Lin.
&8226;Telling him that you have dealt with the problem
&8226;Informing him of the content of the enquiry from Mr. E. King who wants a special wholesale discount
&8226;Telling him the discount that you could offer to Mr. King
&8226;Write 40--50 words on a separate sheet.

炸药的爆力表示炸药爆炸时对介质产生的整体压缩、破坏和抛移的做功能力。()

漏斗体积同炸药埋置深度的关系是埋置深度由大变小时,漏斗体积由小变大,埋置深度为最适宜深度时,漏斗体积达到最大。()

空眼的作用是作为装药炮眼爆破时的辅助自由面和作为破碎体的补偿空间。()

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