题目内容

心力衰竭时，呼吸困难的表现形式有、和。

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心功能不全的代偿反应是、和三大方面。

心功不全的诱因是、、、和。

Although it was his first experience as chairman, be ________ over the meeting with great skill.

A. presided
B. administered
C. mastered
D. executed

The ________ from childhood to adulthood is always critical time for everybody.

A. conversion
B. transition
C. turnover
D. transformation