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| 71. | The key of the coal mining above confined aquifers is to understand the water resistion ability of the coal seam floor. |
| 承压水上采煤的关键问题是煤层底板是否能有效地阻止底板高压水突出。 |
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| 72. | floorboard for road motor vehicles or tractors |
| 道路机动车辆或拖拉机底板 |
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| 73. | Position seat on floor pan. |
| 在底板上定位座椅。 |
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| 74. | retractable floor |
| 可收缩的铲斗底板 |
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| 75. | sawtooth floor channeling |
| 锯形底板开槽法 |
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| 76. | Many actors have influence on water inrush from the floor, of them the geological conditions of the floor are the most important. |
| 底板突水与否取决于多方面影响,其中最重要的是煤层底板条件。 |
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| 77. | deflection chassis |
| 偏转底板|扫描装置底盘 |
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| 78. | a diamond in a gold setting |
| 镶在金质底板上的钻石 |
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| 79. | invert elevation |
| 底板高程;底拱高程 |
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| 80. | turning-over board |
| 翻箱板，造型平板，底板 |
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