诊断胃肠穿孔首选的方法是()
A.腹部X线片(立位)
B.超声
C.上消化道钡餐造影
D.CT
E.胃镜
参考答案:A
It is said that _____ of the students like to help their parents with the housework
A.third-fifths
B.three-fifths
C.thirds-fifth
D.three-fifth
入夏后当西太平洋副热带高西伸脊边缘控制我国沿海时,那里常会出现()
A.雷暴大风
B.台风大风
C.偏南大风
D.平流雾