721.当你替换一个单词时总是确保你选择的替代词不会改变句子的意思 ( )

216.不要将压缩空气出口对着皮肤。 ( )

215.Once designed and approved, the establishment of thorough maintenance procedures is a must ( )

214.The Maintenance Manual and/or Maintenance Data furnished to the Purchaser shall provide sufficient information to enable a qualified mechanic, as appropriate, to inspect troubleshoot, test, and repair or re lace all systems and units considered by the manufacturer to be repairable or replace able as a part of the normal maintenance procedures ( )

213.Except when the Handbook producer is restricted in choice or otherwise limited, the choice is his( )

212.Personnel must obey this procedure( )

211.The procedures should address how often the program will be reviewed to determine if it is current and adequate for the type of maintenance being performed at the facility( )

210.如果过滤器在异常短的时间后堵塞,将它们送到实验室进行污染分析。 ( )

209.Shutoff the airflow in the air conditioning ducts to be inspected ( )

208.MAKE SURE THAT THE TOILET ASSEMBLY FLUSHES CORRECTLY( )

207.简要描述和说明各种新型飞行仪表的工作原理。 ( )