— .
A:Yes, it is
B:No, there is
C:Yes, there is
D:No, it isn't
1.51 × 6=____ 15.1 × 6=____ 151 × 60=____ 0.151 × 6=____
下列关于太阳的叙述正确的是
(Ⅰ)求证:AB⊥平面PAC;
(Ⅱ)若二面角M﹣AC﹣D的大小为45°,试确定点M的位置.