The tapetum begins to vary at the stage of tetrad with the cytoplasm anther cell.

Super-microspore happened in the 5 % ~30 % or more tetrads and its formation was directly concerned with B-chromosome.

四分体中额外小孢子的形成与B - 染色体直接有关,其频率为5%～30%或更高.

The content of sulfoether in catalytic cracking diesel oil was determined by tetraethyl-lead potentiometric titration method.

应用四乙酸铅电位滴定法测定催化裂化柴油中硫醚硫的含量,电位稳定,终点电位突跃明显,结果可靠.

Historically, the primary source of lead emissions has been the result tetraethyl lead additives to gasoline.

从历史的角度讲, 铅挥发的最初来源是添加到汽油中的四乙基铅.

Chapter 3 introduces the variable time-step scheme in combination with solution-mesh refinement on unstructured tetrahedral mesh.

第三章介绍结合变时 步法 之非结构性可调适四面体网格.

An algorithm for generating three-dimensional tetrahedral mesh for simulation of brain deformation is presented.

本文提出了一种用于模拟脑组织变形的三维四面体网格划分算法.

The Rubik's is a toy in the shape of a tetrahedron.

魔方是个四面体的玩具.

Tetrahedron sandstone statues tower, the existing four, descending, were folded pyramid.

四面体砂岩造像塔, 现存4块, 由大到小,呈塔形叠起.

The internal structure of silica has a pyramid ( tetrahedron ) unit .

硅的内部结构是一个 四面体.

The catalysis of big pore strong acid resin for 1, 4-butanediol dehydration to tetrahydrofuran is investigated.

考察了大孔强酸性树脂对1, 4 丁二醇 脱水制四氢呋喃的催化作用.

Removal alcohol from crude tetrahydrofuran, formation principle of peroxidate and antioxidation technique were introduced.

介绍了粗品四氢呋喃的除醇技术, 过氧化物的生成机理与抗氧化技术.

The catalysis of big pore strong acid resin for 1,4-butanediol dehydration to tetrahydrofuran is investigated.

考察了大孔强酸性树脂对1,4 丁二醇 脱水制四氢呋喃的催化作用.

Methods: The mobile was Tetrahydrofuran-acidic water, UV detector was used to quantify and determine Sudan I.

方法: 以四氢呋喃 - 酸性水溶液为流动相, 紫外检测器测定.

The new synthetic route for tetrahydrofuran via direct oxidation of butadiene was introduced.

介绍以丁二烯为起始原料、经乙烯基环氧乙烷制备四氢呋喃的新工艺.

Tetrahymena is applied for detecting toxicity, apoptosis and water quality monitoring at present.

目前已作为标准检测生物被广泛应用于毒性检测 、 细胞凋亡和水质检测中.

Clinic research of one stage surgical treatment of Tetralogy of Fallot in infants.

与婴儿法洛四联症一期根治的临床研究>>相似的文献.

Cultured tet + B cells produced antibodies specific for epitopes of the tetramer antigen.

培养的四聚物阳性B细胞产生大量针对四聚物抗原的表位抗体.

A catalectic tetrameter of iambs marching.

节奏完全按四音步句的抑扬格在行进.

Prediction of self-care outcome of patients with tetraplegia is far more complicated.

对四肢瘫病人的自理结果预测要复杂的多.

The invention relates to a cultivation method of the tetraploid dendrobium officinale.

本发明涉及一种铁皮石斛四倍体的培育方法.

ZnO whisker , the only tetrapod among all kinds of whiskers, possesses good comprehensive properties.

氧化锌晶须是一种立体四针状单晶体微纤维, 其原料来源广泛,成本低廉.