【判断题】教学系统设计的目的在于促进学习者的学习。
【多选题】When views of spur gears are drawn, there are several parameters which should be given, include , and the others.
【判断题】When the spur gears are drawn in sectional views, the section lines should be drawn in gear tooth portions.
【简答题】prehens, prehend 表示—
【判断题】When the spur gears are drawn in sectional views, the section lines should be drawn in gear tooth portions.
【判断题】对废水样品的采集,浅水可用容器直接采集;深层水则应用专制的深层采水器采集。
【单选题】正常听觉,声音由外耳向内耳传导的主要途径是