在铁路实际工作中，通常把通过能力分为（）能力、（）能力和需要通过能力三个不同的概念。
参考答案：设计通过；现有通过
--- The party is so great!
--- Yes, but Johnson, we’ve got to go home. ______
--- Thank you. See you later.
A．Enjoy yourself!
B．See you.
C．I’m very sorry.
D．What about you?
