Using hydraulic supports in heavy grade longwall face with sublevel caving, anti-topple and antiskid are the key factors.

在大倾角倾斜煤层进行综放开采，支架的防倒、防滑成为决定放顶煤开采成功与否的关键。

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For grade eight student but speech, heavy criticize the development of dint in the language memory, the language righteousness apprehension and words.

对于八年级学生而言，重在语言记忆力、语义理解力和话语品评力的培养。

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Heavy. In addition, balanced nutrition intake, health massage, high grade nutrition cream category is the effective method to prevent the bags under the eyes.

重。另外，均衡的营养摄入，保健按摩，优质的营养霜类都是防止眼袋的有效方。

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But any extra Saudi oil released now will be too late in arriving and too heavy a grade to keep America's drivers happy.

ECONOMIST: Other reasons to worry

Nothing that would make the tablet uncomfortable to use, but enough to remind you there's a heavy-duty, laptop-grade processor inside.

ENGADGET: Microsoft Surface Pro hands-on Hands-on

Much of Venezuelan oil is also heavy oil, which is a lower grade.

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