平板封头是压力容器制造中使用最多的一种封头型式。
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Weallfound_____toplaythegame.
Modern____perhapscausesmoreproblemsthanitsolves.
Ihopemyfather____askmeaboutmymarks.
Ineverregretted_____hisoffer,foritwasnotwheremyinterestlay.
Modern（）perhapscausesmoreproblemsthanitsolves.
