丁字接头平角焊最易出现的缺陷有焊脚下垂、（）、（）、（）等。
参考答案：咬边；未焊透；夹渣
When she was asked how she had managed to live _____ with the man she hated so much, she
didn't _____ to the question. [ ]
A. at peace; respond
B. in peace; answer
C. with peace; make an answer
D. in peace; respond
输血反应中最严重的反应是哪一种？造成该反应发生的原因是什么？患者有哪些典型的症状？这些症状发生的机制是什么？
