在其他条件相同的情况下，信用等级越高的债券，收益率越高。 ( )
参考答案：错
— What about going out for a walk after supper?
— ______. Walking after meals is good for health. [ ]
A. I couldn't agree more
B. I'm afraid not
C. I believe not
D. I don't think so
定量供油是指根据柴油机负荷（）供给相应数量的柴油。
