All persons who are in this area must use a respirator.

A. Flash the screen with hot water.

B. Fresh the filter with hot water.

C. Rinse filter in hot running water.

A. Do not exceed this dimension or Mach in any operation.

B. Do not exceed the regulated flight speed or Mach Number in any operation.

C. Do not exceed this speed or Mach Number in any operation.

A. 中心句是一篇文章的第一句，也是最重要的一句。

B. 总结句是一节内容的第一句，也是最重要的一句。

C. 主题句是一段话的第一句，也是最重要的一句。

A. 使用通用工具密封端口。

B. 使用指定的工具封严开口。

C. 端口可以使用特殊的工具封严。

A. The needle moves horizontally along the gage.

B. The pointer moves vertically along the scale.

C. The indicator moves longitudinally along the edge.

A. 这些测试可能需要额外的地面支持设备，应比操作测试更具体和详细。

B. 这些试验可能需要增加地面支持设备，应比操作测试更专业和详实。

C. 这些测试可能需要提供专门的地面支撑设备，应比功能试验更特殊和详细。

A. 计算在巡航功率下飞行45分钟所消耗的油量。

B. 以巡航功率飞行45分钟后计算航班的储备油量。

C. 航班所需的储备燃油量应为巡航功率下45分钟所使用的燃油量。

A. Preset the control to get maximum thrust.

B. Set the control to get maximum thrust.

C. Reset the control to get the maximum force .

A. Functional check L VHF radio found statis interference and noise.

B. Functional check of L VHF radio shown turbulence and static noise.

C. Functional check of L VHF radio revealed interference of static with noise.

A. That portion of the system is used to indicate the quantity, temperature and pressure of the oil.

B. That portion of the system is used to indicate the quality, temperature and pressure of the oil.

C. That portion of the system is used to indicate the quantity, temperature and pressure of the fuel.