下列先心病中,不可能发生艾森曼格综合征的是()
A.肺动脉口狭窄
B.房间隔缺损
C.室间隔缺损
D.动脉导管未闭
E.主肺动脉窗
参考答案:A
This restaurant has become popular for its wide_________ of foods that suit all tastes and pockets. [ ]
A. division
B. area
C. range
D. circle
低合金钢管板垂直固定平位焊时,最好采用()。
A、左焊法、中性焰
B、左焊法、氧化焰
C、右焊法、中性焰
D、右焊法、碳化焰