数字信号送入电力线载波机之前应()
A.A/D转换
B.进行调制
C.进行解调
D.D/A转换
参考答案:B
This book ten units, three mainly revision.
A.contains; including
B.includes; containing
C.contains; containing
D.includes; including
炭粒廓清试验常用来检测()
A.中性粒细胞功能
B.巨噬细胞功能
C.NK细胞功能
D.B细胞功能
E.T细胞功能