underground testing laboratory
常见例句
- By bolt's testing in mechanical properties in laboratory and anchoring force in underground, the conclusion are as follows: its bodys owned high intension and may be recovered and reused.
并通过实验室力学性能、井下锚固力测试得出：新型锚杆的杆体强度高，可回收并可多次复用； 返回 underground testing laboratory