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【简答题】
求以下曲线的切线方程，并求出切点的坐标： (1)曲线x 2 +4xy+3y 2 -5x-6y+3=0的切线平行于直线x+4y=0; (2)曲线x 2 +xy+y 2 =3的切线平行于两坐标轴．
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【单选题】听力原文：W: Air pollution is one of the most serious problems in the world. Polluted air can make us sick or even kill us. Why isn't more done to stop it? M: Everyone wants to stop it, but it is a difficu...
A.
Most people don't think it is a serious problem.
B.
Most of our pollution is caused by things people need.
C.
The government has not spent enough money to stop it.
D.
The seriousness of pollution has not been realized by the government.
【简答题】求 0.05 mol∙dm -3 KHC 2 O 4 溶液的 pH ,如果加入等体积的 0.1 mol∙dm -3 K 2 C 2 O 4 溶液后,则溶液的 pH 又为多少 ? ( K a1 ө = 5.9 × 10 -2 , K a2 ө = 6.4 × 10 -5 )
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