850. The pump is installed upstream of the valve

2513. 警告,告诫,注意可以用于来突出强调关键点

2512. 在与修订部分相对的页面的左边,使用马克垂直线来标识对插图的修订,或使用“指向手势”( )

2511. 在记录本上做登记,表明执行了停用程序

2510. Database synchronization is in process

2509. The lateral axis of the airplane is also called the pitch axis, and movement of the elevators rotates an airplane about its laternal axis

2508. 一些化学品必须良好保存,才能使用。

2507. 此过程需要两个人。

2506. 确保没有沿翼展移动的迹象。

2505. The oil is dangerous if you let it be absorbed through your skin and into your body

2504. Unit or assembly removal/installation procedures may reference a system/subsystem test only if the major test procedure is so utilized that the individual assembly/unit test may be called out without overlap and if accomplishment shall not require completion of the whole system test