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| 低密度装药当自由面与钻孔的夹角较小，且抵抗线 W 小于钻孔长度 h 时,如果不加大装药长度就会炸出桥状漏斗并残留未破坏的炮孔口部，在这种情况下,应采用低密度的炸药装填炮孔，以增加药包长度。开挖巷道时,扩槽炮孔经常采用这种装药方法 | |||
| 轻负荷区架空线路承受轻度冰雪负荷; 轻加感 | |||
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light loading : 9 phrases in 7 subjects |
| Automobiles | 1 |
| Bridge construction | 2 |
| Economy | 1 |
| International trade | 1 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Technology | 2 |
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