图示双极型晶体管（简称晶体管）的小信号模型为（）。
A.
B.
C.
D.
参考答案：D
下列有关船舶应变部署表的提法哪些正确？（）I、应变部署表应在船舶出航前制定；II、船员如有变动，应修定或制定新表；III、应变部署表的格式应经认可；IV、应展示在全船各明显之处
A.I~IV
B.II~IV
C.I、II、III
D.I、III、IV
Though ______ to see us，the president gave us a warm welcome and showed us around.
A. surprise B was surprised C. surprised D. being surprised
