何谓内部效益与成本?何谓外部效益与成本?
参考答案:
内部效益与成本是指由项目投资经营主体获得的收益与相应承担的成本。
—Excuse me,which movie are you waiting for?
—The new Star Wars.We()here for more than two hours.
A.waited
B.wait
C.would be waiting
D.have been waiting
对车身的悬置有哪些要求?