抛物线y=x2-4x+3与x轴交于A、B,与y轴交于C,则S△ABC=( )。
3
The local government has again ______ its words not to swallow the arable land for town building and the farmers can do nothing but swallow it. Which of the following is NOT OK? [ ]
A. swallowed
B. eaten
C. broken
D. let down
女,68岁,有慢性咳嗽、喘息史15年,近日感冒后症状加重,查体:神志清楚,口唇紫绀,桶状胸,双肺叩诊过清音,呼吸音减低,动脉血气分析:PaO55mmHg、PaCO45mmHg,经过治疗后病情缓解。此病人出院后,不适宜采用的治疗是()
A.吸入支气管扩张剂
B.作腹式呼吸,加强膈肌运动
C.家庭氧疗
D.长期口服中等量激素
E.间断应用止咳、化痰药物