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| 可缩性支架具有可缩性材料或〈和〉结构，在地压作用下能够适当收缩而不失去支撑能力的支架; 可缩性支架 | |||
| 伸缩式支护 | |||
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yieldable support : 1 phrase in 1 subject |
| Technology | 1 |
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