肝静脉血汇入下列何结构（）。
A.门静脉
B.肝
C.下腔静脉
D.胃静脉
E.上腔静脉
参考答案：C
8. Obama’s father was among the first to settle in _______ is known as the most fantastic tourist attraction — Hawaii.
A．where
B．what
C．which
D．That
用定位销连接承受振动和有变向载荷的地方宜选用()
A、圆柱销
B、圆锥销
C、槽销
