Wear mechanism and serious wear position of casing pipe in vertical backfill drill-hole

Zip Code:c576f0c85848a14d10428d1b79269fc7d68bde9ba6ecb95648b168a03671c3821c778c2bedf0cae5d03c95a065c3a5efa4243241acb9eb6089885db6f9f3fa7f5b7491eb5af48e7ab43d253e29e0fa6991b0af260ac98903cc7fbca150cb2fc86cb6bd41d95f78a263ba3d6f6aa504ee56cdd8693f2e6f13b576940cee3633de

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Office Phone:998fafd81b4aa1602292d5cfc238cd74ec640ee415b97ae5e925864e1b18e8c60e387cd9c10b919df0aaf165ab4f08c569563a8d61f02d7670521e6d44d615065fe584705cd557f3f86a19211ec295553cbcd9fbca797afa43510caeb5708833c4f266f83ea2c5a922862dafd3b5dd29456fa541aadcd79f2f22dfa3878acc62

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