煤矿矸石山提升机 例句>> 5) Mine hoist 矿井提升机 1. Dual PWM AC-DC-AC variable-frequency adjustable-speed system in mine hoist; 矿井提升机双PWM交直交变频调速系统 2. Study on comprehensive safety control strategy for mine hoist; 矿井提升机安全综合控制策略的研究 3. Application of PLC an...