吸附剂氧化铝的活性与其含水量无关。（      ）
A、正确
B、错误

单项选择题The theory of meaning which relates the maning of a word to the thing it refers to is known as ___________. A、the conceptual theory B、the theory of semantic triangle C、the theory of componential analysis D、the referential theory

单项选择题平第二骶椎横断层面,在CT、MRI图像上,识别卵巢的重要标志是()