地表移动式简易滴灌 1 简易滴灌的制作用5条管径12.7mm～19.1mm长55m的塑料细管做毛管,前5m为首部,5m以后的管壁上用打孔器每隔35cm打一孔径为1.2mm的单孔。2 简易滴灌的使用这种简易滴灌适... 韦公远 - 《四川水利》 被引量: 0发表: 2004年 加载更多 ...
1299357 Copying by scanning K S PAUL & ASSOCIATES Ltd 3 March 1970 [17 March 1969] 13979/69 Heading H4F [Also in Division B6] In a photographic type-composing system wherein a modulated linear trace on a cathoderay tube T is projected on to successive parallel locations on a film F by...
Bottle for baby food having a protective cap which can be pushed onto a screw cap lid, and a washer for such a bottle In a bottle for baby food having a screw cap lid and a teat, as well as a cup-like protective cap which can be pushed onto the screw cap lid, the screw cap ...