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℃
