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单选题
1797. The valves are dual flapper spring-loaded type valves attached to the wheel well side of the wheel well forward bulkhead where the 9-inch (228 mm) ducts from the packs enter the space above the wings
A
The valves are double flap spring-loaded valves mounted on the wheel well side of the front bulkhead of the wheel well, with 9-inch (228 mm) pipes from the assembly into the space above the wing.
B
The valves which are attached to the wheel well side of the wheel well forward bulkhead, where the 9-inch (228 mm) ducts from the packs get into the space above the wings,are of dual flapper spring-loaded type.
C
The valves which are fixed to the wheel well side of the wheel well forward bulkhead are dual flapper spring-loaded type valves where the 9-inches (228 mm) tubes from the units enter into the space above the wings.
答案解析
正确答案：B
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