Lens measuring instrument
透片测量器

• threshold of sensitivity
• threshold population inversion
• threshold power density measurement
• threshold quantity
• threshold region
• threshold voltage
• threshold zonal filtering
• thrihedral reflector
• thrihedral tool-maker's straight edge
• thrihedron
• throttle
• through bolt
• through-hole
• throughput
• throw
• thrower
• thrust
• thrust ball bearing
• thrust bearing
• thulium
• thulium laser
• thumb nut
• thumbscrew
• thyratron
• thyratron light source