— ____________ do you go to school?
— By bike. [ ]
A. How
B. What
C. Where
答案:A
已x1,x2是方程x2+5x-4=0的两个根,那么x1+x2=______,x1x2=______.
沪深300股指期货合约中股票指数点越大,或合约乘数越大,股指期货合约价值也就越小。