滑轮出现裂纹或轮槽不均匀磨损达3mm时应予报废。()
A、正确
B、错误
参考答案:A
可转换债券实际上是一种普通股票的( )。
A.看涨期权B.看跌期权C.百慕大期权D.利率期权
I had to ______ because someone else wanted to use the phone.
A.give up
B.put up
C.hang up
D.ring up