研究表明，事故门井卷吸空气，形成明满交替流是造成一系列不良水力现象的前提。
It is indicated that the suction of air from the emergency ventilating shaft is the reason to cause the harmful hydraulic vibration.
对于井式电梯，如果门忽然打不开，不要慌张，按下警报，然后等待营救人员。
If the elevator doors fail to open upon stopping, push the alarm button and wait until help comes.
但是，该公司还通过落地式大摆钟，壁炉，图画，楼梯井和其他家用固定装置来建造隐蔽门。
But, the company also constructs hidden doors from grandfather clocks, fireplaces, paintings, stairwells, and other household fixtures.
应用推荐