流域面积
下列哪种不是特殊CT造影增强法 ["A.脑池造影CT","B.脑室造影CT","C.肝脏造影CT","D.关节造影CT","E.脊髓造影CT"]
将射线能量转换为可供记录的电信号的装置是 ["A.滤过器 ","B.探测器 ","C.准直器 ","D.A/D转换器 ","E.显示器"]
副鼻窦CT扫描参数选择,错误的是 ["A.层厚5cm ","B.层距5cm ","C.采用小FOV ","D.观察薄骨有否破坏改用薄扫 ","E.薄扫时需降低条件"]
河流一般包括()、()、()、下游和河口五段。
河流的总落差