Companion cells arrange in a row or single cell as long as the sieve tube member.

伴胞为与筛管分子等长的一列或单个细胞。

The utility model relates to a corundum sieve tube used in the field of oil field and oil well production.

本实用新型涉及油田油井开采领域中用到的一种刚玉筛管。

This machine USES the S-shaped milling cutter to extrude materials into particles through stainless steel sieve tube.

本机是用S型碾刀，通过不锈钢筛筒的筛孔，把物料挤出颗粒的设备。

Aimed at the current status of petroleum slotted sieve tube, a kind of new typed slotted sieve tube with compound slot was developed.

针对石油割缝筛管的现状，开发出了一种新型复合缝腔割缝筛管。

The tracheid and sieve tube elements are all differentiated from the procambia in the center of the haustoria, and the former occurs prior to the latter.

吸器中管胞和筛管都是从吸器中央具有原形成层特性的细胞分化的，管胞的分化先于筛管，或同时进行。

The end walls of sieve-tube elements in the phloem have 4-6 specialized sieve areas which together form compound sieve plates.

韧皮部中筛管分子的端壁是由4—6个梯状排列的筛域组成的复筛板。