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单选题
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 float valves in the center tank.
B
Stringers and the upper wing skin are compose of the vent channels. The vent channels got exhaust float valves from the center tank.
C
Stringers and the upper wing skin make the vent channels. The vent channels have drain float valves in the center tank.
答案解析
正确答案：C
相关知识点：
纵桁蒙皮成通道，油箱有活门
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