压力容器设备法兰和接管法兰由于塑性变形过大而导致密封泄漏，是因强度不足而使密封结构失效。
1、正确正确
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Wecanhear（）fromthebackoftheroom.
I______thatIwereabird.
Itisnotuncommonforthere_____problemsofcommunicationbetweentheoldandtheyoung.
Thefirststepinthestudyofanylanguageisobservingand____preciselywhathappenswhennativespeakersspeakit.
____,sheledalifeofcompleteseclusion.
