A.5% B.10% C.20% D.25% E.30%
A.持續(xù)時(shí)間少于100ms B.持續(xù)時(shí)間少于200ms C.持續(xù)時(shí)間少于300ms D.持續(xù)時(shí)間少于400ms E.持續(xù)時(shí)間少于500ms