A:红光的偏折最大,紫光的偏折最小
B:红光的偏折最小,紫光的偏折最大
C:玻璃对红光的折射率比紫光大
D:玻璃对紫光的传播速度比红光大
⑴I'm hungry.____ A. She's running.
⑵What are you doing?____ B. He's making noodles.
⑶What are they doing?____ C. I'm hungry, too.
⑷What is she doing?____ D. They are rowing a boat.
⑸What is Sam doing?____ E. I'm reading a book.
答:____.
设NA为阿伏加德罗常数的数值,下列说法错误的是( )
如图,矩形ABCD的对角线AC与数轴重合(点C在正半轴上),AB=5,BC=12,点A表示的数是﹣1,则对角线AC、BD的交点表示的数是( )