問(wèn)題補(bǔ)充:?jiǎn)芜x題 對(duì)拋物線:y=-x2+2x-3而言,下列結(jié)論正確的是?
A.與x軸有兩個(gè)交點(diǎn)
B.開(kāi)口向上
C.與y軸的交點(diǎn)坐標(biāo)是(0,3)
D.頂點(diǎn)坐標(biāo)是(1,-2)
答案:D
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