欲观察关节盘的病变应用何种检查方法
A．许勒位片
B．关节造影
C．磁共振
D．B和C
参考答案：D
His mother had talked to him for many minutes while he was watching TV, But_______.
A．a little did he hear
B．little did he hear
C．little heard he
D．a little heard he
用阻抗法计算传递函数，电路中的电感当作算子阻抗（）。
A.1/CP
B.1/γp
C.LP
D.1/P
