valve gear
阀齿轮
气门机构
配气机构
阀动装置
阀动机构
气门机件
球阀
pressure reducing valve reducing valve
valve disc type breath valve
1 000 kV ultra-high voltage direct current
1 kV cables of direct buria
储能电路
蓄电池
4丁酸苯酯
1kV直埋电缆
累加器
存储器
110kV direct step-down rectifying equipment
135 MW direct air cooling unit
351 alternating and direct square-waves argon arc welding machine
351 alternating and direct square-waves argon are
3-D direct current survey
三维直流电法
救护飞机(Airam bulances)
4 stages of direct air-cooling development
4100 direct injection diesel engine
4-aminopyrine direct colorimetric method
600MW direct air cooling unit
a direct interpolation method