查询词典 precursor

Diphenyl carbonate is an important carbonic ester, an important precursor for the synthesis of polycarbonate without using phosgene.

碳酸二苯酯是一种重要的有机碳酸酯，是非光气法合成聚碳酸酯的关键原料。

Of all tested plant growth substances, IBA, BA and ABA can promote the development of litchi pistil, while GA has no obvious influence on litchi pistillate and staminate development, putrescine precursor—arginine is helpful to staminate development.

在所试的植物生长物质中，IBA、BA和ABA对荔枝的雌蕊发育具有促进效应；GA对雌雄蕊的发育没有显著影响。腐胺的前体—精氨酸有利于雄蕊的发育。

Therefore, coal tar pitch modified with 4-MB was qualified to be an excellent carbon precursor.

因此，改性后的煤沥青有望作为优质的炭材料基体前驱体。

The precursor or stem cell of a plasma cell.

随意安排的、漫无目的计划是不起作用的。

The precursor or stem cell of a plasma cell .

成浆细胞浆细胞的前体细胞或干细胞。。

Instead of traditional readings, the class studied the following precedents as a precursor to their work.

在研究学生作品前应先研究下列的先例，而非传统的阅读资料。

Al and SiC powders were chosen as active filler and inert filler, respectively, for the fabrication of preceramic-derived multi-phased ceramics, using polycarbosilane as preceramic precursor.

采用微米级Al粉作为活性填料， SiC微粉作为惰性填料，聚碳硅烷作为陶瓷前驱体制备SiC基复相陶瓷。

Al and SiC powders were chosen as active filler and inert filler,respectively,for the fab- rication of preceramic-derived multi-phased ceramics,using polycarbosilane as preceramic precursor.

采用微米级Al粉作为活性填料，SiC微粉作为惰性填料，聚碳硅烷作为陶瓷前驱体制备SiC基复相陶瓷。

Unfortunately, this is a precursor of worse things to come.

不幸的是，这些还只是即将来临的更糟糕的情况的前奏。

That was the precursor to that scene.

那是你说的场景的前面的铺垫。

The statistical analysis of this large set of mutations has led us to propose a diagnostic strategy that should help with the molecular work-up of optic neuropathies.

这一大系列基因突变的统计学分析引导我们提出一个诊断策略，可以帮助我们对视神经病变进行分子学的诊断检查。

The results show that the pipe grouting changes the mechanical parameters of surrounding rocks to achieve the security of engineering objectives by reinforcing surrounding rocks and bolcking the water.

研究表明：小导管注浆一方面改变了围岩的力学参数，另一方面利用浆液的固结特性可以实现堵水和加固围岩的工程目标，使隧道在开挖过程中的安全得到保障。