The effect of basic rock thickness, mining height and advancing speed on roof breaking is analyzed.

并进一步分析了基岩厚度、采高、推进速度对顶板破断的影响。

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The effect of milling depth is the biggest, next is milling speed, and the minimal is advancing speed.

背吃刀量对温度影响最大，铣刀转速次之，进给速度影响最小。

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Facebook needs momentum in emerging markets, where smartphone sales are advancing at breakneck speed.

FORBES: Facebook Phone Faces?An Uphill?Battle In Emerging Markets

"The fiction of a Europe advancing at the same speed towards greater integration, already damaged by the Maastricht setbacks, is now dead, " it says.

BBC: European press review

The megacycle is picking up speed and technology is advancing ever more quickly.

FORBES: Apple, Google, Microsoft, RIM -- Buy 'Em All!