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单选题
隔离活门（ISOL）的主要作用是：the primary purpose of the isolation (ISOL) valve is to:
A
调节总管左右两侧的压力。 modulate the pressure between the left and right sides of the manifold
B
出现引气泄漏时隔离总管。 isolate the manifold in the event of a bleed air leak
C
允许引气源向总管的左右两侧供气。 allow a bleed air source to supply the left and right side of the manifold
D
向左右反推提供增压空气。provide pressurized air for left and right thrust reversers
答案解析
正确答案：C
