在X线片上不显影的结石是
A.草酸钙结石
B.磷酸钙结石
C.尿酸结石
D.胱氨酸结石
E.磷酸镁胺结石
参考答案:C
解析:X线上不显影的结石,从五个备选项来看是尿酸结石。
属非器官特异性自身免疫性疾病的是()
A.重症肌无力
B.萎缩性胃炎
C.系统性红斑狼疮(SLE.
D.自身免疫性溶血性贫血
E.慢性甲状腺炎
A big bush fire ___ in Australia last night, but fortunately everyone ____escape. [ ]
A. took place; could
B. happened; can
C. broke out; was able to
D. happened; could