恒定电流产生的是（）。
A.恒定磁场
B.交变磁场
C.不产生磁场
D.恒定、交变磁场都有
参考答案：A
He is looking for another job because he feels that nothing he does _______ his boss.
A．satisfies
B．serves
C．promises
D．supports
根据句意及首字母提示完成单词。
1. Look! The soccer ball is u___________ the chair.
2. Some p___________ are on the wall.
3. Please t___________ these books to the classroom.
9. The video t___________ is on the table.
4. Can you b___________ these books to school?
