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单选题
493.当FM仪表源选择电门在左位时( )When FM source selection switch set to the left position.
A
MCDU1和MCDU2同FM1交联MCDU1 and MCDU2 is connect to FM1
B
MCDU1和MCDU2同FM2交联 MCDU1 and MCDU2 is connect to FM2
C
MCDU1同FM1交联MCDU1 is connect to FM1
答案解析
正确答案：B
解析：
题目解析
当FM仪表源选择电门在左位时，机组选择了左侧的FM仪表源。正确答案是 B. MCDU1和MCDU2同FM2交联（MCDU1 and MCDU2 are connected to FM2）。这是因为题干中提到“当FM仪表源选择电门在左位时”，意味着选择了左侧的FM仪表源，而正确的操作是将MCDU1和MCDU2连接到左侧的FM2。选项 B 描述了正确的连接状态。
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