脑电波的形成机制是大量皮层神经元同时发生

A．工作电位

B．诱发电位

C．兴奋性突触后电位

D．抑制性突触后电位

E．突触后电位同步总和

A Class C EPIRB（）.

A.is primarily designed for vessels operating up to 50 miles offshore or on foreign waters

B.transmits a signal that can be detected by satellite

C.must be manually activated

D.operates in the medium and low frequency bands