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"]
什么叫油田开发方式？
如何排除燃油系气阻？
生活方式
《煤矿安全规程》规定，（）在采煤工作面范围内再布置另一采煤工作面同时作业。 ["严禁","可以","采取措施，可以"]
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。
