给煤机的启动前检查？
参考答案：
1）给煤机设备完整，内部无杂物，落煤插板开启，检查孔关闭，照明充足；
2）二次风开启；
3）相应的磨煤机启动。
用适当的句子完成对话。
(At Mr. White's office in a middle school)
A: Hello! 1 ?
B: Speaking, please.
A: I'm Peter's mother. I'd like to ask for a leave for my son.
B: 2 ?
A: He doesn't feel well this morning. He has a cold.
B: 3 . Is it serious?
A: Not very serious. But the doctor asked him to stay in bed and have a good rest.
B: Don't worry. 4 .
A: Thank you, sir. Goodbye!
B: Bye!
1._____2._____3._____4._____
上颌全口义齿的腭隆突、切牙乳突区属于
A．主承托区B．副承托区C．边缘封闭区D．缓冲区E．翼缘区
