直径大于20mm以上的钻孔用（）来测量。
A.内径量缸表
B.公法线卡尺
C.深度千分尺
D.量棒
参考答案：A
老年人爱发脾气，情绪低落，是老人缺乏（）。
A、维生素D
B、维生素C
C、维生素B族
D、维生素A
用in, at, for, of, with填空。
1. Look ________ the picture.
2. I have porridge ________ breakfast.
3. They are playing ________ their friends.
4. We get up ________ the morning.
5. This is a picture ________ a library.
