不定项选择

焊接电流过大不会导致烧穿缺陷。

A．正确
B．错误

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To maintain an undervalued currency, the country’s monetary authorities must intervene in the foreign exchange market to buy its currency in the foreign exchange market.( )

答案：错误

单项选择题

抬举性心尖搏动见于
A、左心室肥厚
B、右心室肥厚
C、右心房肥大
D、左心房肥大