当m( )时,函数y=(m2﹣2m﹣3)x2+(m﹣2)x+m是二次函数. 发布时间:2017-05-09 05:38 │ 来源:www.tikuol.com 题型:填空题 问题: 当m( )时,函数y=(m2﹣2m﹣3)x2+(m﹣2)x+m是二次函数.
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题型:填空题 临床上出现急性二尖瓣返流时,常有()A.PCWP超过肺动脉收缩压B.PCWP低于肺动脉舒张压C.PCWP波形出现高大的Q波D.PCWP>肺动脉舒张压E.肺动脉收缩、舒张压均高于PCWP 查看答案