信号设备联锁关系的临时变更或停止使用，须经谁批准？
参考答案：信号设备联锁关系的临时变更或停止使用，须经铁路局批准。
腭裂术后语音治疗的适应证有（）
A.术后获得良好的腭咽闭合功能者
B.年龄＞4岁
C.听力测试＞40db
D.智商＜70分
E.术后1个月以上
What's he doing? He's ______________ on the bed. 
What's he doing? He's ______________ a picture. 
What's he doing? He's ______________ a book. 
What's she doing? She's ______________ lunch.