spring wheat mulched with plastic film  地膜春小麦

Spring wheat with plastic film mulches  地膜春小麦

spring wheat spring corn intercropping system  春小麦/春玉米

spring wheat with different gluten type  不同筋型春小麦

wheat mulched with film  地膜小麦

winter wheat mulching with plastic films  地膜冬小麦

Bunch sowing mulched with plastic film  覆膜穴播

Ditch sowing in double-ridge mulched with plastic film  全膜双垄沟播

Drip irrigation mulched with plastic film  膜下滴灌

dry farming rice mulched with plastic film  水稻旱作覆膜

mulched with plastic film  地膜覆盖

ridges mulched with plastic sheet  垅盖膜

vegetable filed mulched with plastic film  保护地

corn mulching with plastic films  地膜玉米

A Thoracentesis Needle with Spring-loaded Valve  压阀式胸腔穿刺针

China spring wheat  中国春小麦

Cylinder Helix Spring with Variable Stiffness  变刚度圆柱螺旋弹簧

door spring with rod  带闩门弹簧

Dry land spring wheat  旱地春小麦