状态寄存器
参考答案：保存外设当前的工作转台信息，处理器通过该寄存器掌握外设状态，进行数据交换。
根据首字母提示完成单词
1. No students are a to go into computer house.
2. Anna wants to get her ears p____ .
3. We all d with what you said just now.
4. Don’t be s____ .He can’t tell you the truth.
5. Our teacher are s____ with themselves. They work hard and teach us so well.
焊接电流的选择，碱性焊条选用的焊接电流比酸性焊条小（）。
A.15％左右
B.10％左右
C.20％左右
D.25％左右
