当张力大于金属的屈服强度δs时,金属发生()。
参考答案:塑性变形
吸入性损伤气管插管可能的并发症有()
A.气管溃疡
B.气管瘘
C.通气不畅
D.食管气管瘘
E.气管狭窄
He asked me just to sit down and drink some water ____ I could say anything about my travel plan.
A.while
B.when
C.if
D.before