通过增加帧缓冲存储器的位面和（），就可以让光栅显示器显示彩色或不同级别的灰度。
参考答案：帧缓存数量
_______ for the excellent work he has done in education, Mr Bright is going to give us a talk this
Wednesday night. [ ]
A. known
B. having known
C. has been known
D. is known
为降低中间粉仓式制粉系统的耗电量。应采取哪些措施？
