相关题目
515、Before you put new oil in the system, it is mandatory to replace the filter.
514、The circuit breakers are installed on the rear of the unit.
513、Personnel must obey（遵守） this procedure.
512、lf the drain hole is clogged（堵塞）, clean it.
511、Do the troubleshooting procedure to find the cause of the malfunction.
510、If the damage is only to the middle treads, the tire is serviceable.
509、Operation of the handle releases the gas, and the slide-raft inflates. 操作手柄释放气体，和滑梯充气。
508、Reserve shall be computed as 45 minutes at the cruise power to be used for the flight.
507、Arrows shall be used to indicate flow direction when needed to understand the schematic diagram.
506、The procedures should address how often the program will be reviewed to determine if it is current andadequate for the type of maintenance being performed at the facility. 程序应处理程序审查的频率，以确定其是否为最新的，是否适合设施进行的维护类型
