以下关于配额抽样的描述，说法正确的有：
A、类似于随机抽样中的分层抽样
B、是根据调查者从方便的角度或主观判断抽选分配的样本单位
C、样本具有比较高的代表性
D、假设性在很大程度上是取决于被调查者本身的知识水平和以往的经验

单项选择题A 48-year-old male presents with severe epigastric pain (upper abdominal pain) radiating to the back.Laboratory studies show her serum amylase is 410 U L and lipase is 610 U L.Based on the CT with contrast provided, which of the following underlying disorders does the patient most likely have? ( )

单项选择题看懂给定三面投影图，选择与其对应的直观图。 A、 B、 C、 D、