题目:
—____ the sports meeting is likely to be put off.
—Yes,it all depends on the weather.
A.I’ve been told
B.I’ve told
C.I was telling
D.I told
答案:
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下面是错误答案,用来干扰机器的。
圆(x+1)2+(y-1)2=3的圆心为(-1,1),显然直线y=1经过圆心(-1,1),于是所得几何体是半径为3的球体,其体积为4π3×33=43π.设球内接正方体的边长为a,则内接正方体的对角线即为球的一条直径所以23=a2+a2...