The controlling - velocity step for the enantioselective reduction is the decomposition of the B - O - B - N 4 - numbered ring.

该不对称催化还原反应的控制步骤是催化剂 - 烷氧基硼烷加合物的B -O-B-N 四元环的离解.

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High properties transparent Si 3 N 4 - BN - SiO 2 ceramic composites with Si - B - O - N based were prepared by gas pressure sintering ( GPS ).

本研究选择 Si3N4 -BN-SiO2体系,通过气氛压力烧结工艺 ( GasPressure Sintering,GPS ) 研制了耐高温、抗冲刷Si-B-O-N系陶瓷透波材料.

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Is this where I have to check in for the B . O . A. C. flight to Delhi?

乘坐英国海外航空公司飞往德里的航班是在这儿检票 吗 ?

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B . o . a . c . announced the departure of flight number BA 712 to Zurich, Rome and Dehli.

英国海外航空公司飞往苏黎世 、 罗马、德里的BA712次航班现在开始登机.

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B : O . K. Let me try to explain to you one more time in simple , plain English.

好吧! 让我用最白话的英文再跟你解释一遍.

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