【单选题】对于线性规划问题,下列说法错误的是:( )
A.
若线性规划问题存在可行解,则问题的可行域为凸集
B.
线性规划问题的基本可行解对应该线性规划问题可行域的顶点
C.
若线性规划问题有最优解,一定存在一个基本可行解是最优解
D.
线性规划问题的基本可行解中,所有分量都是大于零的
【简答题】Web Search Search billions of web pages Google Chrome A browser built for speed, simplicity and security Mobile Get Google products on your mobile phone Maps for mobile View maps, your location and ...
【单选题】Rescue Platform In the aftermath of the terrorist attacks on the World Trade Center, security experts are trying to develop new ways of rescuing people from buming skysrapers. One idea is a platform. ...
【单选题】A repurchase agreement is a transaction in which______.
A.
a lender agrees to buy back securities at a specified future date at a predetermined price
B.
a borrower agrees to buy back securities at a specified future date at a predetermined price
C.
a borrower agrees to sell back securities at a specified future date at a predetermined price
【单选题】一台单相变压器的额定容量 ,额定电压为 ,满载时,次级端电压为 ,则其额定电流 和 分别为( )。
【简答题】现有六种运放构成的电路模块如下,请选择正确的答案填空。 A 、反相组态电路 B 、同相组态电路 C 、求和电路 D 、减法电路 E 、积分电路 F 、微分电路 (1) 若要实现电压增益为 -100V/V 的放大电路,应选用 。 (2) 若要实现电压增益为+ 100V/V 的放大电路,应选用 。 (3) 若要在正弦波电压上叠加一个直流电压,应选用 。 (4) 若要将三角波信号转换为方波信号,应选用 ...
【单选题】一台单相变压器的额定容量SN=50kVA,额定电压为10kV/230V,空载电流I0为额定电流的3%,则其空载电流为( )。
【单选题】Fortunately there are still a few tasty things for us gourmands to enjoy in relative security. Their numbers, however, are depleted almost daily, it seems, by ruthless proclamations from the ever-vigi...
A.
they disagree with the FDA
B.
salt doesn't stick to potato chips
C.
they would have to spend more money
D.
it isn't important to single out salt