肝脏肿瘤（）
A．平扫
B．增强扫描
C．灌注扫描
D．高分辨率扫描
E．薄层扫描
参考答案：B
—Shall I help you?
—Sure. Such a difficult case is ______ I could handle myself.
A．rather than
B．less than
C．or rather
D．more than
气是 ① 和 ② 的最基本物质。
