请教，有直系亲属在美国的话，签证很难过么？[6.27 成都 Check]

我的姐姐在美国f2好几年了，现在我拿了AD去签PHD的f1签证，这种形势对我来说是不是万分凶险啊，请教大家有什么好的建议？

---------------------------------------谢谢大家的解答—————————————————————————————

今天的面签，除了等的时间稍久，其他都很顺利。之前还挺担心的，看来现在F签证的形势真的非常好，附上对话，希望有参考价值。
PS:面我的VO长的像极了兄弟连里的尼克松上尉。

Me: Good afternoon, Officer.
VO: So, you are going to XXXXXXXXXX?
Me: Yeah, i will pursue my Phd degree in electrical engineering
Vo: Where is your undergraduate?
Me: I' m from xxxxxx, where i got my bachelor degree.
Vo: So, you don't have a advisor?
Me: Yeah, I haven't been asigned one.
Vo: Have you ever been to American?
Me: No.
Vo: Give me your CV, study plan, transcripts
Me: A second plz. Here you are.
Vo: Ok, you're approved. You may need two to four weeks to .....没听清 看见在撕条了
Me: Ok. Thanks. Have a good one

希望早日clear吧~~~~ {:4_107:}