债券价格是债券现金流的现值，债券价格的变化与债券收益率的变化（）
A.无关
B.方向相同
C.方向相反
D.比例相同
参考答案：C
When I wanted to buy a computer, I saved as much as I could, and my mother the rest of the money.
A．kept up
B．held up
C．tool up
D．made up
ZD6系列电动转辙机自动开闭器各接点片压力均匀，接触压力不小于（）。
A.0.49N
B.0.98N
C.0.4N
D.9.8N
