等规指数是在规定条件下,不溶于沸腾的()的质量百分数.
A、丙酮
B、乙醇
C、异丙醇
D、正庚烷
参考答案:D
Why these things happened was ____ the driver had been careless.
A.because of
B.owing to
C.due to
D.that
大量呕血时可出现以下症状,哪项不准确()。
A.都伴有黑便
B.某些患者出现的失血性休克症状可出现在呕血前
C.出血早期血象无变化
D.不出现发热
E.可出现氮质血症