试写一个有两个不相等实根的一元二次方程( )
I can't go to the New Year's concert,______,100 dollars is just too much for me to spend in one evening.
A.in other words B.that is C.in particular D.I mean
复合树脂充填时窝洞消毒剂除下列哪种外均不宜采用
A.50%麝香草酚
B.樟脑酚
C.丁香油
D.木榴油
E.75%乙醇