“drilling equipment”簡單造句，drilling equipment造句子

In recent years, the development of underground drilling equipments is very active and rapid.

The new products, new structures, new technicals and new development of drilling equipments, carryscrapers, trucks and auxiliary operation equipments in foreign underground mines are described.

「It is applied to product requiring high corrosion resistance, good weldability and medium strength, such as naval vessel, automobile,airplane,low-temperature equipment, television tower, drilling equipment, transportation equipment, missile component and armor.

Pneumatic crawler drill rig is a kind of rock drilling equipment in construction.