A large U-Mo deposit was found on the northern margin of north China Platform, where the Mesozoic and Cenozoic volcanics are developed. This area is widely covered by the Quaternary sediments.
在华北地台北缘中新生代火山岩发育区，发现大型铀钼矿床，其外围被第四系广泛覆盖。
2
Arm length to ensure that all projects can be covered and a slight margin is appropriate.
臂长以保证能够覆盖全部工程并稍有余量为宜。
3
Violating margin requirements, however, triggers a margin call and open positions are automatically covered until requirements are met again.