4-triazol 5-one High explosive train

five low-three narrow-one high

One Driving Two

One-one

one-one (=injective)

one-one mapping

put one one’s thinking cap

Two one one Team

high-high level float switch

high-high sump level

double-compression with expander driving high-pressure stage

One class elementary school; One room school; One teacher school; Single room school

one class school; one room school; one teacher school; single room school

One room school; One class elementary school; One teacher school; Single room school

One teacher school; One class elementary school; One room school; Single room school

Single room school; One class elementary school; One room school; One teacher school

composite high school; comprehensive high school; cosmopolitan high school

Composite high school;Comprehensive high school;Cosmopolitan high school

Comprehensive high school;Composite high school;Cosmopolitan high school