在基层材料的结合料中，掺入一定量的（）可降低收缩系数。 ["水泥","石灰","沥青","粉煤灰"]
Refer to the exhibit. For what two reasons has the router loaded its IOS image from the location that is shown? （） ["Router1 has specific boot system command that instruct it to load IOS from TFTP server.","Router1 is acting as a TFTP server for other routers.","Router1 cannot locate a valid IOS image in flash memory.","Router1 defaulted to ROMMON mode and loaded the IOS image from a TFTP server.","Cisco routers will first attempt to load a image from TFTP for management purposes."]
简述传统经济学关于竞争与垄断的基本观点。
无限大介质中弹性平面波纵波波速比弹性杆中平面波纵波波速（）。 ["大","小","相等","无法确定"]
我国法定继承分为两个程序，即第一顺序和第二顺序。
平行研究
