A:on the Sunday
B:on a Sunday
C:on Sunday
D:at a Sunday
当一束光通过鸡蛋清可以观察到丁达尔现象,这表明鸡蛋清属于( )
一游客在乘缆车匀速上山的过程中,他的动能 ____,重力势能 ____,机械能 ____.(填“增大”、“减小”或“不变”)
看图,选词填空。
Dear Bob,
Please come to my twelfth birthday party tomorrow evening. Now let me tell you how to come.
A. left B. science museum C. east D. park E. flat