求翻译来英语帝.使馆内问题，，，我要表发自己毕业后想回中国 因为学石油工程在中国可以进中石油这样的国企待遇很好 如何表达？还有就是如何表达因为如果预约北京的签证时间久太迟了 所以选择了上海领事馆。。？

1.I'd like to return China after my graduation,because learning petroleum engineering in China can have chance into petrochina such state-owned enterprises which the treatment is very good.
2.As it took long time to book the visa in beijing,so I change to shanghai consulate.