紊流粗糙区的水头损失与流速成（）。 ["一次方关系","二次方关系","1.75～2.0次方关系","二分之一次方关系"]
跌水和陡坡的区别
What does a router do?（） ["Stores data on the network and connects the local-area network (LAN) to the wide-area network (WAN)","Routes traffic down alternative paths and connects the local-area network (LAN) to the wide- area network (WAN)","Broadcasts data to all devices that are connected to it across the local-area network (LAN) and wide-area network (WAN)","Reads Media Access Control (MAC) addresses to forward messages to the correct location and connects the local-area network (LAN) to the wide-area network (WAN)"]
浮动利率债券的利率在确定时一般要与市场利率挂钩，其与市场利率的关系是（）。 ["高于市场利率","低于市场利率","等于市场利率","没有关系"]
患者张某，咳痰无力，护士小张给予促进排痰，使用叩击和振颤法，正确的操作时：（） ["在餐前2h或餐后30min进行","左侧卧位","避开乳房，心脏和骨突（脊椎、胸骨、肩胛骨）部位","叩击时五指并拢成空杯状，利用腕力从肺部由上向下、由外向内，快速有节奏地叩击胸背部","双手交叉重叠，按在腹部，配合患者吸气时自下而上震颤、振动加压"]
随着施工进程，混凝土坝的混凝土垂直运输方案，如何随工程的形象进度变化而变化，以适应工程施工的需要？
