499.告诉所有人员离开该区域。

273.伺服控制组件

272.The pressure lines divide in different directions.

271.The schematic diagram should tend to deal with an overall system
rather than with subsystems, e.g., the air conditioning system rather
than a compressor or blower within the air conditioning system.

270.用适用的公式计算压力。

269.High-time airplanes, disassembled for major overhaul, were inspected
to assist in selecting inspection items.

268.确保孔的直径小于规定值。

267.When the selector is in the 100% position, the user will( ) pure
oxygen.

266.If the pressure supply stops, cancel the test.

265.如果风速高得危险,请不要打开货舱门。

264.如果套筒连接不正确,则需进行调整。