国家是维护统治阶级利益的暴力组织，二警察则是这个组织中执行国家专政职能的工具（ ）

His sister left home in 1998, and _____ since. [ ]

A. had not been heard of

B. has not been heard of

C. had not heard of

D. has not heard of

填出图中人体主要的内分泌腺：

垂体瘤手术切除标本通过免疫染色法，发生率依次为（）

A.无功能瘤>PRL瘤>GH瘤>ACTH瘤

B.无功能瘤>PRL瘤>ACTH瘤>GH瘤

C.PRL瘤>无功能瘤>GH瘤>ACTH瘤

D.PRL瘤>GH瘤>ACTH瘤>无功能瘤

E.PRL瘤>ACTH瘤>GH瘤>无功能瘤

清热地黄汤的功用是（）

A.清营解毒，透热养阴

B.清热开窍，息风止痉

C.清热解毒，凉血散瘀

D.清肺宁肝，凉血止血

E.清热开窍，豁痰解毒

加氢富液与干气、液态烃富液有何不同？