【单选题】非营利组织的采购部门通过传播媒体发布广告或发出信函,说明有关要求,邀请供应商在规定期限内投标的购买方式叫( )
【单选题】The Jutes, Angles, and Saxons were different tribes of ____.
【简答题】The Britons of the Celtic tribes were the forefathers of the modern()
【单选题】The Celtric tribes were .
A.
the earliest settlers in Britain
B.
at war with each other
C.
based their settlements on henges
【多选题】The Celtic tribes were ancestors of __________.
【判断题】制动器的作用之一是电梯遇紧急情况时使曳引机停车,轿厢停止运行。
【判断题】制动器的作用是当轿厢到达所需层站或电梯遇到紧急情况时使曳引机迅速停车、电梯停止运行。
【判断题】电梯制动器的作用是使轿厢停止和保护轿厢的停止状态。()
【判断题】制动器的作用是当轿厢到达所需层站或电梯与紧急情况时使曳引机迅速停车、电梯停止运行。