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单选题
当引气电门选到MANUAL并且引气源选到APU时，打开机翼防冰将：With the bleed air switch selected to MANUAL and the bleed source selected to APU, turning wing anti ice on will:
A
导致APU LCV关闭并且发动机引气活门打开。Cause the APU LCV to close and engine bleed valves to open.
B
不提供机翼防冰，APU LCV 保持打开。Not provide wing anti ice. APU LCV will remain open.
C
导致APU为机翼防冰提供引气。Cause the APU to source wing anti ice.
D
导致所有可用引气源打开，进入引气总管。Cause all available pneumatic sources to open to bleed air manifold.
答案解析
正确答案：B
