多跨静定梁为了更清晰地表示各部分之间的支承关系,可以把基本*部分画在下层,而把附属部分画在上层,这称为()
A.层次图
B.叠加图
C.上下图
D.弯矩图
参考答案:A
下列关于基差的说法,正确的有()。
A.套期保值的效果主要由基差的变化决定
B.基差-期货价格-现货价格
C.特定的交易者可以拥有自己特定的基差
D.正向市场中,基差为正值
Though the long-distance runner ______ his previous record last month, his trainer let him ______ its speed as he went around the curve..
A.bettered; slowed
B.better ; to slow
C.bettered; slow
D.better; slow