Austin-Flint杂音是指主动脉瓣膜关闭不全时相对性二尖瓣狭窄引起

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问题判断题

Austin-Flint杂音是指主动脉瓣膜关闭不全时相对性二尖瓣狭窄引起的舒张期柔和的舒张早、中期隆隆样杂音。（）

答案

参考答案：对

选择题

Li Na plays____________ tennis very well. She has become _____________first Asian woman to reach a Grand Slam(大满贯) final.

A．a, the

B．/, the

C．the, a

D．/, a

单项选择题

The farmers stored up a good()of wheat and a () of beans this year.

A. number; lot

B. deal; number

C. plenty ; lots

D. deal; lots