题目：
为保证出水水质，均匀级配粗砂滤料的滤层厚度比单层细砂滤料( )。
A．小
B．大
C．大200mm
D．大300mm
答案：
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参考答案：C解析：乳腺内侧及后侧组织在常规拍摄时，有可能包不全。故疑该区域病变可在常规拍摄位置后加拍乳沟位。
为保证出水水质，均匀级配粗砂滤料的滤层厚度比单层细砂滤料( )。 A．小 B．大
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