短語詞組短語reserve shutdown availability time 備用停堆可利用時(shí)間time availability 時(shí)間可用度;時(shí)間利用率;時(shí)間可用性time availability of system 系統(tǒng)時(shí)間可用度finite time availability 有限時(shí)間可用性net drilling time availability 純鉆時(shí)間利用率 返回 availability time