Deng Yaping was born _____ February 6th, 1973. [ ]
A. on
B. to
C. at
D. in
答案：A
利用配方法证明代数式-10x2+7x-4的值恒小于0。由上述结论，你能否写出三个二次三项式，其值恒大于0，且二次项系数分别是l、2、3。
肝硬化( )
A．渗出液B．血性腹水C．两者均有D．两者均无E．以上说法都有可能
