当你在现货市场上买入玉米时，你可同时在期货市场上卖出一张等同数置的玉米期货合同，因为你预测玉米价格将会下降。
When you buy the corn from the cash market, you can sell short a futures contract of the same amount com on the futures market in anticipation of the com prices falling.
本文提出一种改进边界元法，它使形成的边界元方程不隐含本征量，避免大阶数矩阵的转置。
A modified boundary element method is proposed. In the approach, the matrices in the formed boundary equation implicitly contain no eigen parameter.
另一方面，同步在采用“模-数-模”方法实现的模拟信号置乱加密通信中非常重要，必须在信息信号中加同步头信号。
On the other side, synchronization in "analog-digital-analog" scramble communications is very important, and the synchronizing signal must be inserted into information signals.
利用四元数矩阵的加权共轭转置定义了四元数矩阵的加权左（右）序，给出了加权左（右） 序的一些等价刻画，推广了以往文献的相应结果。
The weighted right (left) star partial ordering is defined though the weighted conjugate of the matrix , some characterisation of its is obtained, the existed results are extended.
CVC - RI与使用导管腔数、置管时间、置管部位有关。
CVC-RI is related to the number of catheter lumen, catheter time, catheter position.
第二章刻画了一类满足三项递归关系的实零点多项式序列的零点位置和零点重数的关系。
In the second chapter, we characterize the relations between locations and multiplicities of zeros of a sequence of real-rooted polynomials defined by a three-term recurrence relation.
第二章刻画了一类满足三项递归关系的实零点多项式序列的零点位置和零点重数的关系。
In the second chapter, we characterize the relations between locations and multiplicities of zeros of a sequence of real-rooted polynomials defined by a three-term recurrence relation.
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