在下列哪一种情况不应该见到上腹部搏动（）。
A.右侧胸腔积液
B.腹主动脉瘤
C.肝血管瘤
D.二尖瓣狭窄
E.三尖瓣关闭不全
参考答案：A
对单机容量为300MW的燃煤发电厂，其厂用电电压宜采用下列哪项组合？（）
A.3kV，380V
B.6kV，380V
C.6kV，660V
D.10kV，380V
The agent has probably already handed over you the stowage plan,（）?
A.isn't he
B.doesn't he
C.hasn't he
D.didn't he
