Mother's Day
Women's Day
Father's Day
Children's Day
25%
50
?
40%
A:20
B:30
C:40
现在是3:30 ( )
一实验小组用某一单色光做双缝干涉实验时,在距离双缝为1.0m处的光屏上,测得1至5条亮纹间的距离为7.6mm.已知所用的双缝间距离为0.25mm.
Miss Li is our g____ of the trip.
下列作品中不属于解放区优秀小说的是( )