clasp hook [= clip hook

hook and hook turnbuckle

Switchover between one hook and two hook operation

BCS theory (=Bardeen-Cooper- Schrieffer theory)

Brunauer-Emmett-Teller adsorption theory (= BET adsorption theory)

collision theory hard sphere theory

grey theory and fuzzy theory

hard sphere theory collision theory

idea in the theory philosophic theory

lipoid-sieve theory lipoid-filter theory

Literature Theory Literature Theory

TRIZ theory of inventive problem solving theory

TRIZ(theory of inventive problem solving)theory

Ⅰshaped hook

a lifting hook catching things automatically

AC hook plate

Acromioclavicular hook plate

adjustable hook spanner

adjustable stop hook