Special preparation of packagings for testing . , Erther vented closures shall be replaced by similar non-vented closures or the vent shall be sealed .
试验前容器的特殊准备工作:将有通风口的封闭装置以相似的无通风口的封闭装置代替,或将通风口堵死。
A helium line unexpectedly vented , eventually leading ground support crews to a ring that had come loose from a seal .