焊条直径是指焊芯直径。
参考答案:对
When he lived in the countryside, he ___ get up early.
A.used
B.would
C.use
D.should
最有意义的影像学检查为
A.腹部B超
B.腹部平片
C.上消化道造影
D.腹部CT
E.血管造影