55.This system shows the pilot the deviations from the localizer course and the glideslope path.

A. Obey the safety precautions when you do work with high voltages.

B. When working with high resistances,you should follow the safety precautions.

C. The safety precautions are optional in an environment with high voltages.

A. Wrap two tapes around the pipe connectors.

B. Wrap the pipe joints with tape twice.

C. Wind two layers of tape around the pipe joints.

A. The Check List may be designed by "Challenge" and "Response" headings or by "Item" and "Condition" headings for two pilot airplanes or for single pilot Airplanes.

B. The Check List for the pilot may be set by "Challenge" and "Response" headings for two airplanes or by "Item" and "Condition" headings for single Airplane.

C. For two pilot airplanes,"Challenge" and "Response" headings may be used on the Check List.For single pilot Airplanes,"Item" and "Condition" headings may be used.

A. 真空设备将空气注入到化合物中。

B. 真空设备可以抽走化合物中的空气。

C. 真空设备用于从化合物中提取空气。

A. 通风系统使飞机产生不同的压力从而将废气排出。

B. 飞机利用通风系统将空气排出机外。

C. 通风系统利用压差将空气排出飞机。

A. Be careful not to get acid on your skin.

B. Prohibit not to get acid on your skin.

C. Be careful not to get alcohol on your skin.

A. Humidity adjustment is manual.

B. Pressure adjustment is automatic.

C. Temperature adjustment is automatic.

A. Make up for all gaps which are larger than 0.05 mm.

B. Repair all cracks that are wider than 0.05 mm.

C. Overhaul all fissures which are greater than 0.05mm.

A. 如果不实施保护,这种材料会导致表面腐蚀。

B. 在没有保护的情况下,这种材料的表面会出现腐蚀。

C. 这种材料会腐蚀未受保护的表面。

A. 给凸起的固定环和堵塞指示器打保险。

B. 给滚花固定环和堵塞指示器本体打保险。

C. 给带凸边的密封环安装保险丝,以固定指示器本体。