base unit of measurement
计量基本单位

• sidewise
• sidewise-scattered
• sield-stop reticule combination
• sieve method
• sift
• sift converter
• sift defect
• sift device
• sifter
• sifting coupling
• sifting property
• sift invariant
• sift lock
• sift matrix
• sift operation
• sift register
• sight
• sight alidade
• sight alignment
• sight axis
• sight bead
• sight ga(u)ge
• sighting
• sighting board
• sighting disk