单项选择题
The theory has been championed for a number of reasons, but many current proponents point to the presence of methane on comets, meteors, and other lifeless planets as evidence that organic material is not needed to produce. A、envisionedB、demonstratedC、complementedD、advocated
单项选择题 镜片开槽机一般不适用于（）材料
单项选择题 2.单片机中不包括以下哪一逻辑部件（ ）。
单项选择题 双光镜子镜片顶点高度是指子镜片顶点位于配戴者瞳孔垂直下睑缘处时，从子镜片顶点至（）处的距离
