风湿性心脏病主动脉瓣狭窄时,下列各项表现中不正确的是
A.主动脉瓣区喷射性收缩期杂音B.主动脉瓣区第二音减弱C.脉压小、脉搏细弱D.左心室明显扩张E.左心室肥厚
参考答案:D
36.Valli, who was born in Pula, in_______is now Croatio, made her film debut in Italy in the mid-1930s.
A.what
B.where
C.that
D.Which
功率较大的电动机直接启动时有较大的冲击电流,为了避免启动电流对电网的冲击,对大功率的电动机采用()。