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单选题
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.
A
Stringers and the upper wing skin are called vent channels; The vent channels go through drain floatvalves in the center tank.
B
Stringers and the upper wing skin are composed of the vent channels. The vent channels got exhaust floatvalves from the center tank.
C
Stringers and the upper wing skin make the vent channels. The vent channels have drain float valves in thecenter tank.
答案解析
正确答案：C
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