T1WI为低信号T2WI为高信号
A．脂肪组织B．白质C．骨皮质D．胆固醇E．脑脊液
参考答案：E
—I’m afraid I have to leave for Miami tomorrow.
—___________
A．I’m afraid not.
B．Have a good journey.
C．Please do.
D．Can’t you stay a bit longer?
僵苗形成的原因是什么？
