我
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- A.<img src="//img1.yqda.net/question-name/45/ce2a4e4b748fff8bd67e5b49076cb4.png" width="47" height="42"/>
- B.<img src="//img1.yqda.net/question-name/60/c3de9de24471def899c545b0c348b4.png" width="39" height="47"/>
- C.<img src="//img1.yqda.net/question-name/5d/14b06aa023decd6f4ba6ad104146fe.png" width="48" height="50"/>
- D.<img src="//img1.yqda.net/question-name/e1/67fc52b907c697a01db6198792de3d.png" width="44" height="41"/>
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- A.上凹，没有拐点
- B.下凹，没有拐点
- C.有拐点(a,b)
- D.有拐点(b,a)
