Secondary xylem consists of pitted vessels, parenchyma fibers and rays.
次生木质部由孔纹导管、薄壁组织及射线所组成。
small bundles of spiral vessels
螺纹导管的小维管束
Furthermo re, the zinc vaporating and oxydizing cause air bubble, incomplete fusion and cr ack.
锌挥发和氧化会导致气孔、熔合及裂纹。
Study on the Structure of Bordered Pit Membrane and Micropores on Margo of Cunninghamia Lancelata Tracheid;
杉木管胞具缘纹孔膜及其塞缘微孔构造
Motor vehicles--Pneumatic braking systems--Tapped holes and male fittings
GB/T14171-1993汽车气制动系管路螺纹孔和管接头外螺纹
Test and Research on the Frictional Loss of Prestress in the Corrugated Pipe Duck;
波纹管孔道预应力摩擦损失检测与研究
Application Research of Ripple Steel Tube Culvert of Small Aperture in Highway Engineering
小孔径波纹钢管涵洞在公路工程中的应用研究
Crack analysis and treatment on steam drum pore water of steam boiler
蒸汽锅炉汽包进水管孔裂纹分析与处理
The Cause Analysis of Crack on Tube Plate and Tube of One Boiler
一起锅炉管板管孔及烟管管口裂纹的原因分析与改进
conduct, of porous common pottery (excl. insulating electric conduit tubing)
普通陶质多孔导管（不包括电绝缘导管管材）
Black of the card
盲孔(纹板上无孔的部分)
Conduits for electrical purposes--Outside diameters of conduits for electrical installations and threads of conduits and fittings
GB/T17194-1997电气导管电气安装用导管的外径和导管与配件的螺纹
Study on Vibration Diagnosis of Crack in the Jacket Platform;
导管架海洋平台裂纹的振动诊断研究
A corrugated or perforated conducting plate in a storage battery.
极板网栅，蓄电池电极板蓄电池中呈波纹状或有孔的导电板
Effect of cell membrane perforation caused by myclobutanil on Spodoptera litura SL cell membrane permeability
腈菌唑导致的细胞膜穿孔对斜纹夜蛾SL细胞膜通透性的影响
Experimental study on desulfurization efficiency in spouted bed with spotting punch draft tube
开孔导流管喷动床脱硫率的实验研究
Optimization study of drilling riser guiding holes
海上钻井隔水导管导向孔位置优化研究
To Observes the Babies and Infants Use Nasal Cannulae or Changed Two-sided Hole Pipe Attracts the Oxygen Therapy Effect;
婴幼儿双孔吸氧管吸氧和改良双侧孔导管吸氧疗效观察