A.所用鎮(zhèn)靜藥半衰期時(shí)間長(zhǎng),而手術(shù)時(shí)間相對(duì)短 B.芬太尼用量大 C.肌松藥的殘留作用 D.吸入全麻藥時(shí)間長(zhǎng) E.肥胖