1184、Advisory circular is information provided by FAA that is not mandatory

　FAA provides advisory circular which is not always carried out aircraft.

　Advisory circular is the procedure that must be used when performing maintenance on an aircraft.

　Advisory circular must always be carried out on aircraft.

正确答案：A

解析：

解析:注释: mandatory 强制性的; not 可以用否定同义词替换,但不能不会直接变成肯定,故可直接排除 B、C

305、单词列表只突出显示主要更改。

304、 The dictionary includes some unapproved words that can be technical names if you can put them inthe applicable technical name category.

303、Fire seals are those fire-resistant partitions and seals mounted on or about the power package for thepurpose of isolating areas subject to fire.

302、Where possible and practical, language and writing style obey the rules and the dictionary of STE.

301、MAKE SURE THAT THE TOILET ASSEMBLY FLUSHES CORRECTLY.

300、Before you do this procedure, engage the ramp service door safety connector pin. 在执行此步骤之前，请连接斜坡服务门安全连接器插销。

299、校装包括设置钢索张力，调节飞控舵面的行程限位和设置行程止动点。

298、Use a word that is unapproved in the dictionary only when it is a technical name or part of a technicalname.

297、The injury to your skin and lungs can occur. 皮肤和肺部的损伤可能会发生。

296、简要描述和说明各种新型飞行仪表的工作原理。