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无煤柱护巷分为沿空掘巷和（）
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无煤柱护巷分为沿空掘巷和（）
时间：2021-09-02 15:22
关键词：
联大
河南理工大学
矿山测量学
答案解析
沿空留巷
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A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
无煤柱护巷分为沿空掘巷和（）
根据煤层赋存情况、地质条件和所采取的技术措施不同，沿空掘巷可分为以下方式（）。
最新问题
护巷煤柱保持稳定的基本条件是：煤柱两侧产生塑性变形后，在煤柱中央存在一定宽度的弹性核，弹性核的宽度应不小于煤柱高度的（）倍。
具有冲击地压煤层的采区应尽量不留煤柱，采用沿空留巷或沿空掘巷，如需留煤柱时，其宽度不得大于（）米，形状应规则不得有锐角。应采用合理的采煤方法、顶板管理方法和落煤工艺，保证顶板充分冒落，并及时报废不需要的巷道。开采时采空区不得留有煤柱、木垛或其它板垛，如果在采空区留煤柱或板垛，必须将煤柱、板垛的位置和尺寸及影响范围标在（）。
无煤柱开采沿空送巷和沿空留巷时，应采取防止从巷道的（）向采空区漏风的措施。
Mainly east 3 or 4 partly cloudy to overcast occasional rain（）slowly south moderate or good.
（）any case or suspected case of quarantinable disease，or any case of eruptive disease or any death be discovered，the local quarantine officer must be notified immediately．
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系统中雷达状态包括Unknown、Operational（or ON）、Failed（or OFF）、Detached。
Owners are to be responsible for loss of or damage to the goods or delay in delivery of the goods only in case the loss，damage or delay has been caused by the improper or negligent stowage of the goods．This means that（）.
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