煤炭开采、自行车、钟表等行业正处于行业生命周期的()。
A.幼稚期
B.成长期
C.成熟期
D.衰退期
参考答案:D
—Cathy, could you come to our art club tomorrow?
—______.
A.I'm sorry to hear that
B.Sure, I'd love to
C.Never mind
D.You're welcome
预付账款与应收账款在性质上有何区别?