指环虫与三代虫的主要区别是()
A.头部有无眼点
B.外形有差异
C.运动形态不同
D.虫体大小不等
参考答案:A
Neither of them knew what was doing.
A.other
B.others
C.the other
D.another
A.QAM
B.QPSK
C.GMSK
D.DMT