A:热能
B:化学能
C:蒸汽能
D:光能
如图,用投影仪将图形放大到屏幕上,若光源到幻灯片的距离为20cm,到屏幕的距离为60cm,且幻灯片中的图形的高度为6cm,则屏幕上图形的高度为____cm.
读问句,选择对应的答句。
____①What's the weather like today? A. No, you can't.
____②Where are my books? B. Yes, it is.
____③What time is it? C. It's rainy.
____④Can I wear my new skirt? D. It's twelve o'clock.
____⑤Is it cool? E. They're on the bed.