【单选题】以下哪种酶缺陷是异染性脑白质营养不良髓鞘形成不良的主要原因()
【简答题】v. gradually make sth. weaker or destroy it: ___________________
【简答题】v. persuade somebody gently or gradually
【简答题】v. to gradually become less serious or extreme
【简答题】v. (cause to)develop gradually (使)逐步发展
【简答题】v. to flow away from the shore; to gradually decrease
【简答题】v. develop gradually