八名局长级官员
eight director-level officials
局长级官员
directorate grade officers
1kV级五芯电力电缆
kV class 5- core power cable
多级五代柴油机油
The fifth generation diesel engine lubricating oil with multilevel
三段五级预防
three levels of prevention
双线连续五级船闸模型
double-line continuous five-class shiplocks model
双线五级船闸
double-line and five-flight shiplock
双线五级连续船闸
double-way and five-step continuous ship locks