在棱长为2的正方体中，M、N分别为棱AA´和BB´的中点，若θ为直线CM与D´N所成的角，则sinθ=（　　）

A 36个 B 72个 C 120个 D 96个

A 18 B 16 C 14 D 10

A 15 B 20 C 25 D 35

A <img src="https://www.beizhujiaoyu.com/uploads/202208/20181003152304_7749.png" width="21" height="27" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/20181003152309_8508.png" width="26" height="25" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/20181003152314_1419.png" width="23" height="30" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/20181003152319_3779.png" width="21" height="29" />

A <img width="49" height="21" src="https://www.beizhujiaoyu.com/uploads/202208/20190918212129_6047.png" /> B 133 C 70 D 63

A 相交但直线不过圆心 B 相交但直线通过圆心 C 相切 D 相离

A 448 B 1140 C -1140 D -448

A 5 B -5 C 5/2 D -5/2

A <img src="https://www.beizhujiaoyu.com/uploads/202208/20181003152204_2998.png" width="93" height="14" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/20181003152210_9072.png" width="94" height="17" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/20181003152215_5146.png" width="184" height="18" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/20181003152219_7407.png" width="194" height="19" />

A (2ⁿ-1)² B <img width="96" height="38" src="https://www.beizhujiaoyu.com/uploads/202208/20190918212150_5578.png" /> C <img width="88" height="38" src="https://www.beizhujiaoyu.com/uploads/202208/20190918212151_5109.png" /> D 4ⁿ-1