classes:  lecturer. so equipped with additional curtains to cover the window because doubledot when opening the projector, the bottom of the class viewing is not clear.  curriculum. so equipped with additional curtains to cover the window because doubledot when opening the projector, the bottom of the class viewing is not clear.  facility. so equipped with additional curtains to cover the window because doubledot when opening the projector, the bottom of the class viewing is not clear.  general. so equipped with additional curtains to cover the window because doubledot when opening the projector, the bottom of the class viewing is not clear.