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

familiarity

familiarity effect

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

1AW of high level Liquid wastes

1S0 level

20 kV voltage level

20kV voltage level