A:无理数包括正无理数、0和负无理数
B:π3 是有理数
C:无理数是带根号的数
D:无理数是无限不循环小数
⑴My favourite song is the ABC song.____
⑵Tom goes to the zoo on Saturdays.____
⑶Look at the dog. It's thin.____
⑷The sweater is on the bed.____
⑸—What are they? ____
—They're trees.
A. B. C. D. E.
①平型关大捷②台儿庄战役③百团大战④孟良崮战役