空间四杆机构
spatial four-bar mechanism
space four-bar linkage
空间四连杆机构
space four bar linkage mechanism
昆明工学院地质系；西南有色地勘局三○四队
Kunming Institute of Technology
老厂四勘区
Explorational Area 4 of Laochang
类四杆五杆机构
five-bar linkages similar to four-bar linkages
可熔性聚四氟乙烯
melt-processable polytetrafluoroethylene
Melt - processable polytertrafluoroethylene
离散四元数余弦变换(DQCT)
discrete quaternion cosine-transform(DQCT