What a nice paper fish! Can you show us __________ you make it?
A:whether
B:how
C:why
D:what
如果tanα=0.213,那么锐角α的度数大约为( )
一本练习册的厚度是0.60厘米,共计80张纸,则每张纸的厚度是____厘米,合____米.