551.Use the mark to help you put the clamp in its correct position( )

386.未经允许,请勿进入发动机测试区域。 ( )

385.2mm 的数值是被允许的。 ( )

384.From the top sentences, the reader will understand the contents of your text and will find specific information quickly ( )

383.If the humidity changes frequently, put a cover on the unit( )

382.该信息应与能帮助识别可能超过飞机及其防冰系统认证能力的结冰状况的信息一起提供。( )

381.You can also do this test with a locally made tool ( )

380.Water displacing corrosion inhibiting compound has been applied during construction on certain airplanes Ain the locations shown in this figure Periodic reapplication in these, and other locations, is required to maintain effectiveness of this protection ( )

379.Install the dump valve and the correct gasket( )

378.洗飞机后,发现三个起落架都未润滑。 ( )

377.剪断并抛弃保险丝。 ( )