MRI信号通常是指（）
A.90°脉冲序列信号
B.纵向恢复接收信号
C.自由感应衰减信号
D.共振吸收信号
E.射频信号
参考答案：C
Everyone had an application form in his hand, but no one knew which office ___.
A．to send it to
B．to send it
C．to be sent to
D．to have it sent
北宋诗人俞紫芝《宿蒋山栖霞寺》云：“独坐清谈久亦劳，碧松燃火暖衾袍。夜深童子唤不起，（）。”
