The rock bolt for superspeed hardening agent sandwich cement cartridge is a simple and valid rock bolt as a support.
超硬夹心水泥卷锚杆是一种简单有效支护锚杆。
The rock bolt for superspeed hardening agent sandwich cement cartridge is a simple and valid rock bolt as a support.
超硬夹心水泥卷锚杆是一种简单有效支护锚杆。
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