肾内的"蛋壳样钙化"，常见于下列哪种疾病（）
A.甲状旁腺功能亢进
B.肾囊肿
C.慢性肾小球肾炎
D.急性肾小球肾炎
E.高尿钙症
参考答案：B
The agency, ______ to set and enforce health standard for American workers, has been promising a cotton dust standard for several years.
A．which is
B．which it is
C．whose job it is
D．of whose job is
下列各项中，除哪一项外，均是防止乳痈的措施（）
A.防止皮肤破损
B.保持 * * 清洁
C.避免哺乳
D.产后煎服橘核水
E.经常提拉、按摩 * *
