The planer and knee types of milling machine is _____ because of its flexibility.
· used most commonly
· most popular
· the most commonly
· most powerful
出自:佳木斯大学语言治疗学

完成拼图验证

按住下方滑块,将拼图拖到缺口处后松开。

拼图背景,将小拼图拖到缺口处
向右拖动滑块