A:Her mother
B:Her uncle
C:Her aunt
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.
more knowledge, he attended many classes last year.
当你投掷铅球时(如图),右手肱二头肌和肱三头肌的状态分别是( )