下位机不时读取设备状态数据,将其转换成数字信号反馈给()。
A、中控系统
B、终端系统
C、计算机
D、上位机
参考答案:D
阅读以下对话,选择正确答语。
Boy: Who's that woman?
Girl: She's my aunt. She works in a school.
Boy: What does she do?
Girl: She is a teacher. She teaches English.
Boy: How does she go to school?
Girl: She usually goes to school by bus.
1. The girl's aunt works in a ______________.
A. hospital
B. school
C. company
2. The girl's aunt is a ______________.
A. teacher
B. doctor
C. farmer
3. The girl's aunt teaches ______________.
A. English
B. Chinese
C. music
4. The girl's aunt usually goes to school ______________.
A. by bike
B. by ship
C. by bus
牙隐裂最好发于()
A.上颌第一磨牙
B.上颌第二磨牙
C.下颌第一磨牙
D.下颌第二磨牙
E.上下颌前磨牙