【单选题】男,72岁,戴全口义齿3年,因牙槽嵴萎缩,全口义齿需重衬,进行全口义齿重衬时,选择的印模技术应是
【单选题】如图,在直角坐标系中,射线OA与x轴正半轴重合,以O为旋转中心,将OA逆时针旋转:OA?OA 1 ?OA 2 …?OA n …,旋转角∠AOA 1 =2°,A 1 OA 2 =4°,∠A 2 OA 3 =8°,…要求下一个旋转角(不超过360°)是前一个旋转角的2倍.当旋转角大于360°时,又从2°开始旋转,即∠A 8 OA 9 =2°,∠A 9 OA 10 =4°,…周而复始.则当OA n 与y...
【单选题】选购翡翠花件时,以下哪种说法是正确的?【】
B.
打灯照射,如果能看到其中的裂纹,这种花件就不能购买
C.
如果裂纹出现在花件的背面,就不会影响翡翠的价格
D.
表面有明显的裂纹,只要价格便宜,还是可以购买的
【简答题】A.256 B.160 C.128 D.96
【简答题】A.256 B.142 C.128 D.96
【单选题】One of the reasons given by Lubetzky for his job-quitting notice is that ______.
A.
he treats hos team as a "family"
B.
he can save a large amount of money
C.
changing job is regarded as a life transition
D.
the news of changing jobs should be kept in secret
【简答题】如图所示,△OA 1 A 2 、△OA 2 A 3 、△OA 3 A 4 均为直角三角形,则OA 10 =______.