低合金高强度钢焊补时,必须(),焊补后或补焊过程因故停顿后,必须立即进行(),以去除扩散氢。
参考答案:预热;热处理
-I really don’t know how to make a good relationship with that person over there.
-Just be careful.He is really__________here
A.everybody
B.anybody
C.somebody
D.nobody
下列哪种情况急需用西地兰治疗()。
A.心衰并阵发性室上性心动过速
B.急性心肌梗死
C.病毒性心肌炎
D.窦性心动过速
E.预激综合征并房颤