胚的哪部分结构将其他部分连接在一起( )
A.胚芽
B.胚轴
C.胚根
D.子叶
答案:B
Danny is playing and Tom is playing . [ ]
A. piano, football
B. a piano, a football
C. piano, the football
D. the piano, football
FIS单中哪项体现生产年份()
A.流水号
B.PR号
C.KNR号
D.底盘号