相关题目
If a fastener is over-torqued, internal stress is present. Internal stress is more important than design stress, because stress corrosion is difficult to recognize before it has overcome the design safety factor. The level of stress varies from point to point within the metal. Stresses near the yield strength are generally necessary to promote stress corrosion cracking.
描述飞机燃油系统时，应说明和阐述加热器如何对燃油加温（如适用）。
描述飞机燃油系统时，应描述如何避免和发现燃油受污染的方法。
If fuel or lubricating oil spills, clean the area immediately. A wet surface is dangerous and can cause you to fall.
如果温度有可能降到-20摄氏度，拆下电瓶。
对插图进行修改时，可使用黑色的 竖线或小手来标识修订之处。
When the area is sufficiently cool, polish the surface.
When the smoke control relay R648 energizes, it supplies 28v dc to energize the supply system control interrupt relay R645.
When the pressure decreases, the indicator shows that there is a leak.
When the weather is very bad, keep these parts in a dry area.
