等角正割圆锥投影图的纬线是()。
A:直线
B:曲线
C:不同心的圆弧
D:以圆锥顶点为圆心的圆弧
参考答案:D
--- Julia hurt her back when she fell, and she is now in hospital.
--- Oh, really? I _____ know. I _____ go and visit her.
A.don’t; would
B.didn’t; will
C.don’t; will
D.didn’t; am going to
空心活动配水管柱目前最多能配注()层。
A、二
B、三
C、四
D、五