The hydrogenation of terpineol to dihydroterpineol catalyzed by Raney Nickel modified by potassium borohydride was studied. 研究了以硼氢化钾修饰的雷尼镍催化剂催化松油醇加氢制备二氢松油醇的反应.
I didn't know Ron had that much strength of character.我当时不知道罗恩有那么坚强的个性。"Why didn't you appoint Ron twelve months ago?"—"Good question."“你为什么12个月前不任命罗恩呢？”——“问得好。”The songs were arranged by another well-known bas...
She sings in the school choir.她是校合唱队的成员。The choir sang the words out with great vigor.合唱团以极大的热情唱出了歌词.The church choir is [ are ] singing tonight.今晚教堂 歌唱 队要唱诗....
If you have vertigo it seems as if the whole room is spinning round you.如果你头晕，就会觉得整个房间都旋转起来。He had a dreadful attack of vertigo.他忽然头晕得厉害。True vertigo should be distinguished from pseudovertigo.真性眩晕应当与假性眩晕区别开来....