One of the reasons that causes oil flowed from sludge outlet of a self-cleaning purifier is （） ["seal water supply be cut off","make-up water supply be cut off","oil outlet valve closed or not open sufficiently","the flow rate of oil is too much"] ISDN基本接口的终端采用（）和NT供电方式：自备电源、NT供电或通过网络来供电。 ["LINK","NT","TA","TE"] 如何考虑与计算两班制运行中机组启动停机引起的煤耗增加？ 由某土的颗粒级配曲线获得，则该土的不均匀系数Cu为（） ["50","6","155","10.935"] ISDN基本接口的传输码型采用（）码。 ["AMI","BRI","HDB","PRI"] 下图1表示某生态系统的食物网，甲一庚代表不同的生物。下列有关叙述不正确的是（）