久期最长的债券是 ( )
A．高附息30年期债券
B．低附息30年期债券
C．零息30年期债券
D．无法判断
参考答案：C
The novel will________soon, and I think, it will be well received by the teenagers. [ ]
A. put out
B. turn out
C. come out
D. go out
为什么工作面“敲帮问顶”必须使用长把工具？
