N butyl 2 ethoxy thioacridone was prepared from o chloro benzoic acid and p phenetidine by means of Ullman reaction,cyclization,N alkylation and sulfurization. 以邻氯苯甲酸和对乙氧基苯胺为原料,经过胺的苯基化、二芳胺的环化、N-烷基化、硫代化反应合成了N-丁基-2-乙氧基硫代吖啶酮。
I mind my p's and q's whenever I see him. 每当我见到他我都谨慎行事。
In English, b, p, m and w are bilabials. 英语中的b、p、m、w为双唇音。
7. acetophenone p; 7.
AB and CD intersect at (the point) P. AB线和CD线在P点相交。