男性，43岁，体检发现AFP>500μg/L，肝、肾功能正常。有HBsAg阳性史6年。对确诊最有帮助的检查是（） ["肝动脉造影","MRI或CT检查","腹部X线检查","同位素肝脏扫描","肝组织活检"]
冲击韧性
When an UNDO segment is created manually by you, its availability status is set to which of the following automatically by Oracle?（） ["Online ","Pending online ","Offline ","Stale"]
根据尼古拉兹实验，简单叙述沿程水头损失系数λ在不同流态的变化规律。
一般路基是指修筑在良好的地质、水文、气候条件下的路基。通常认为一般路基可以结合当地的（）、地质情况，直接选用典型横断面图或设计规定。但高填方路堤，深挖方路堑须进行个别论证和验算。 ["地形","水文","气候","地质"]
如何排除燃油系气阻？
