患者,男性,20岁,右眼红3天就诊,眼部检查(如图)所示,角膜透明,诊断为()
A.右急性结膜炎
B.泡性结膜炎
C.可能为病毒性结膜炎
D.右慢性结膜炎
E.滤泡性结膜炎
参考答案:B
等差数列{an}中,|a3|=|a9|,公差d<0,那么使前n项和Sn最大的n值为( )
A.5
B.6
C.5或6
D.6或7
2()
A.initial scope definition
B.requirements modeling process
C.object modeling process
D.architecture design process