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
