What are the requirements for drilling tools for drilling?

The bit is directly broken part of the rock, its shape, structure, material, processing technology, etc. directly affect the crushing effect and the life of the bit. The drilling requirements for the drill bit are:
Shape reasonable structure, high drilling speed, lo

MES Technoservice wins long-term engine maintenance contract

It is reported that Mitsui Shipbuilding's subsidiary MES Technoservice has received a long-term engine maintenance contract from the merchant ship Mitsui LNG Transportation (Europe), which will provide 20-year maintenance service for LNG ships managed by Merchant Marine Mitsui LNG.

Dry and dry high-altitude trucks easy to "fire"

Dry and dry, easy to cause fire, hot summer is also a frequent occurrence of auto-ignition accidents, the owners and drivers of aerial vehicles should be careful. The traffic police department once analyzed the auto-ignition incident: i