恶心呕吐,呃逆嗳气等症频作,其病机是
A.痰浊上壅
B.肺气上逆
C.肝气上逆
D.胃气上逆
E.奔豚气逆
参考答案:D
She was busy, or she _________ him more help. [ ]
A. had given
B. would give
C. could have given
D. give
浇注20MnSi钢第一包开浇的温度控制在()℃
A、大于1505℃
B、大于1520℃
C、大于1540℃