The amount of fluid delivered by a helical pump can be regulated by ().
A. throttling the pressure line
B. changing the speed of the rotor
C. either A or B
D. None of the above is tree
查看答案
营业厅遇到计算机系统运行故障的特殊事件时,应如何处理?
将锻件均匀地放在地面上并处于静止空气的冷却称为空冷。
A. 正确
B. 错误
线粒体在超微结构上可分为();()、膜间隙、基质。