28、纵桁和上翼面蒙皮构成通风通道。通风通道在中央油箱内有排放浮子活门.

　Stringers and the upper wing skin are called vent channels;The vent channels go through drain float valvesin the center tank.

　Stringers and the upper wing skin are composed of the vent channels.The vent channels got exhaust floatvalves from the center tank.

　Stringers and the upper wing skin make the vent channels.The vent channels have drain float valves in thecenter tank.

正确答案：C

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1150、 This section gives you the procedures for the disassembly. 本节将为您提供拆卸的步骤。

1149.This section explains how to check flight instruments for recognizing a malfunction. 本节解释如何检查飞行仪器以识别故障。

1148、In some cases, wires are color coded and these should be indicated on the wiring diagram.

1147、文本应尽可能简明扼要。

1146、Database synchronization is in progress.

1145、参考下表以获得适用的扭矩值

1144 、 Make sure that the position of the clamp agrees with the position that you recorded during the removal procedure.

1143 、 The internal horn turns ON land stays 0N as long as the detector has power and the smoke sensor detects smoke.

1142、在切口上粘贴第一层胶带,再呈对角线粘贴第二层和第三层胶带。

1141、安装天线时,对齐箭头必须朝前。