endless magnetic tape loop

coupling mechanism between upper level and low level jet

fiscal system at county level and township level

interaction between upper level and lower level

municipal level and county level

assembly-prestressing form finding loop by loop

loop-within-loop

microbial loop microbial food loop

the loop knitting without loop

tape to tape converter

0℃ level

0℃ level height

1 000 m level span

1 000 MW level

10000 at county level

100p% firing level

110kV insulation level

11-level

125℃ level