当收益率曲线向上倾斜时，即短期利率高于长期利率，卖出债券，预期利率上升时，买入债券。
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The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.
A. reduce water temperature
B. reduce water turbulence
C. provide an air cushion
D. allow for an increase in water volume as the engine warms u
计算题：一管材延伸系数λ为5.16，拉伸前外径为34mm，壁厚为1.34mm，试计算该管材拉伸后的面积？
90年代幼儿家庭教育指导的形式比较集中。
A. 正确
B. 错误
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