To increase the access of HBS On-line, we no more need an software for our certificate courses. (Programs are still necessary for our credential systems: CORe and CLIMB.) You can now promptly enroll and start taking the next step inside your job. 但是了解笔刷的特性，并且灵活运用，才是重点。比如用水彩笔调整过后可以用来画过渡。 SAI1:             https://graces975mfg0.wikifiltraciones.com/user