A.持續(xù)時(shí)間10~300ms,間歇時(shí)間為持續(xù)時(shí)間的3~5倍,三角波
B.持續(xù)時(shí)間10~300ms,間歇時(shí)間為持續(xù)時(shí)間的10~20倍,三角波
C.持續(xù)時(shí)間.1~10ms,間歇時(shí)間為持續(xù)時(shí)間的3~5倍,三角波
D.持續(xù)時(shí)間300~500ms,間歇時(shí)間為持續(xù)時(shí)間的3~5倍,三角波
E.持續(xù)時(shí)間1~10ms,間歇時(shí)間為持續(xù)時(shí)間的10~20倍,方波