A.低于 B.接近 C.高于 D.等于
A.數(shù)值不很大、持續(xù)時(shí)間短 B.數(shù)值不很大、持續(xù)時(shí)間長(zhǎng) C.數(shù)值很大、持續(xù)時(shí)間短 D.數(shù)值很小、持續(xù)時(shí)間短