女性,35岁,2个月来每于饭后1小时上腹疼痛。进食不缓解,呕吐后减轻。需做以下哪项检查有助于诊断()
A.腹部B超
B.胃镜
C.胃液分析
D.CT
E.便隐血试验
参考答案:B
There is no possibility ______ all the students can pass the college entrance examination.[ ]
A. what
B. which
C. that
D. whether
催化剂加料不稳会造成反应温度波动,使产率波动。