Spring precipitation anomaly

spring precipitation in North China

Spring precipitation of Jiangxi

precipitation during spring sowing season

precipitation in spring

Spring and summer precipitation in China

the precipitation in spring

artifical increase of precipitation precipitation

Precipitation precdiction

precipitation preconcentration

Spring Force of Constant Torque Spring and Wing-up Spring

contact spring pile-up (contact spring assembly)

half-elliptic spring(semi-elliptic spring)

hard spring， hardening spring

plate spring (plate-form-spring)

plate-form spring (plate spring)

Shape and Spring Back of Constant Torque Spring

soft spring ，softening spring

soft spring， softening spring