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Chapter 517 Drilling hoist one or two things
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Chapter 519 Ji Chongxuan's team is here
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... d.
"Yeah, I'm just wondering about this..." Zhao Siyan said expectantly.
Zhao Guoyang sat up straight, and said calmly: "This problem should be discussed from the composition of the drilling hoist."
"Drilling hoist is a kind of mine hoisting machinery. It is generally called a mine hoist internationally. It is mainly composed of a working mechanism, a braking system, a mechanical transmission system, a lubrication system, an observation and an operating system, and a dr ...
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