民用航空器必须具有民航局颁发的（）方可飞行
A.适航证
B.经营许可证
C.机场使用许可证
参考答案：A
用所给单词的适当形式填空。
1. My aunt's son speaks _____ (China) very well.
2. It's Monday. My uncle is _____ (real) busy today.
3. These kids usually have three _____ (class) in the morning.
4. It is Tuesday, December _____ (ten).
5. His grandfather is a great _____ (music).
X6132型铣床工作台工作面积（宽×长）为（）。
A、320mm×1250mm
B、1250mm×320mm
C、1320mm×1250mm
D、132mm×1250mm
