扩散加权成像和灌注加权成像主要的临床应用是（）
A.脑肿瘤
B.脑出血
C.急性脑梗死
D.脑外伤
E.脑炎
参考答案：C
. — At present we students have access to many valuable English websites to learn English.
— As far as I know, English on line.com is a free site ______ visitors can not only learn the English language but also chat on line.
A．where
B．which
C．that
D．what
投币式唱机
