白云岩
参考答案:
以白云石为主要成分组成的岩石。白云石含量>50%。
ˉWhy did she spend so much time searching shop after shop for a time?
ˉ Oh, she was _____ about her clothes.
A.particular
B.curious
C.special
D.unusual
患者男,45岁,排便后痛,昨日突然加剧,肛口可扪及一肿块,直径1.5cm,紫色,触痛。应采取哪项治疗最佳()
A.坐浴
B.封闭
C.口服药物
D.注射硬化剂
E.血栓外痔剥离术