电荷的_______移动形成电流，我们把____________________

FOXPRO数据库管理系统规定日期型字段宽度为______字节。( )

A．4
B．6
C．8
D．10

单词拼写

1. You'll need p__________ and understanding if you're going to be a teacher.

2. If anything happened to the kids, I'll never f__________ myself.

3. Li Xiaopeng o__________ his success to hard training and good skill.

4. It seems f__________ to give them a second chance.

5. I do want you to know how much I t__________ our friendship.

刀具主偏角的变化主要影响轴向切削力与（）向切削力的比值的变化

A、法

B、切

C、径

D、垂

已知铁的比热容为0.46×10³J/（kg•℃），其物理意义是______．由此可知，要想使质量为5kg的铁块温度升高2℃，需要吸收的热量为______．

标准按照性质可分为技术标准和管理标准两类。