M1
溯河性鱼类生活在江河，但溯至海洋中繁殖。
铁路旅客运输合同是明确承运人与（）之间权利义务关系的协议。 ["托运人","收货人","旅客"]
下列哪个不是成本控制的内容（） ["控制资源耗费","控制费用开支","控制生产经营过程","控制人力耗费"]
What is the action of "pop" in the context of MPLS switching？（） ["It removes the top label in the MPLS label stack.","It adds a top label in MPLS label stack.","It replaces the top label in the MPLS label stack with another value.","It replaces the top label in the MPLS label stack with a set of labels.","None of above."]
单缸机
