Taking p chlorotoluene as raw material , 2,4 Dichlorotoluene was synthesized via catalytic chlorination process.以对氯甲苯为原料, 经催化氯化制取2,4二氯甲苯.In the reaction of chlorination, carbon tetrachloride was used agent, and chlorine ...
She senses that behind the clowning there is a terrible sense of anguish.她感觉到在这种滑稽可笑行为的背后隐藏着极大的痛苦。Bev made her laugh, the way she was always clowning around.贝夫用她一贯滑稽耍宝的方式逗她发笑。Doesn't all of this seem like rather que...
两个共振峰下面的面积是不相等的.The areas under the two resonance envelopes are unequal.通过考察收集的离子电流信号中的共振峰可得到离子的荷质比、回旋频率等参数.Analyzing the resonant peak to acquire the charge - mass ratio and cyclotron frequency of the ions.共振峰: 使用了对频谱的振...
A promise is a promise. ( made a promise and keep a promise ) .信守承诺. 阿甘信守了承诺,最后也得到了最好的 回报.It is easier to make a promise than to keep a promise.作出承诺容易,实现承诺不易.Herod had John beheaded to keep a promise.希律为了守所起的誓把约翰斩头....