现代测向技术大致可分为（）类。
A.幅度测向
B.相位测向
C.功率测向
D.相位幅度相关矢量测向和超分辨率测向
参考答案：A, B, D
The speaker ________have criticized the paraprofessionals, knowing full well that they were seated in the audience.
A．should not to
B．must not
C．ought not to
D．may not
磁石的功效是（）。
A.镇惊安神
B.收敛固涩
C.聪耳明目
D.平肝潜阳
E.纳气平喘
