A:2m>2n
B:0.5m<0.5n
C:log2m>log2n
D:log0.5m>log0.5n
选择合适的句子补全对话。
Amy: Where is my ruler, John?
John:____
Amy: No, it's not in my pencil box.
Amy: Yes, thanks.
A. Look, it's on your desk. B. Is it in your pencil box?
能体现我国气候资源优势的气候特点是( )
①转动粗准焦螺旋②转动细准焦螺旋③调节光圈④转动转换器⑤向右上方移动装片⑥向左下方移动装片