The synthetic conditions of 2-pentylidene cyclopentenone using PTC were stud-ied, and the conditions of isomerization were also studied.

对相转移催化合成2-戊叉环戊酮及其异构化的条件进行了研究。

youdao

For the present, safety systems such as PTC will not be sufficiently capable in most cases to address this type of hazard.

目前，现有的安全系统，如PTC(列车自动控制系统)，在许多情况下面对此类危险都不能提供足够的安全保证。

youdao

I think some of the things PTC is thinking and working about are very promising and following industry demands.

我对PTC现在正在谋划和已经开始着手做的某些事情充满希望，这些事都紧跟行业需求。

youdao

My question is in regards to the ITC and the PTC -- the investment tax credit and the production tax credit, renewable energy.

WHITEHOUSE: Building a Clean Energy Economy

Moreover, while the patient base for Duchenne may be too small to spark a billion-dollar drug, the PTC chemical could work against similar underlying gene flaws in other disorders such as cystic fibrosis, hemophilia and spinal muscular atrophy.

FORBES: Stopping the Nonsense

Another common test, which can be purchased online, is to give people a particularly bitter chemical such as PROP or PTC, which are similar to a compound found in many dark-green vegetables.

WSJ: People Who Taste Too Much