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单选题
为了在预处理空气连接单向阀在打开位置不工作时放行飞机，执行以下步骤。
A
For release with the ground preconditioned air connection single valve inoperative in the open position, do these steps.
B
For dispatch with the ground preconditioned air connection check valve inoperative in the open position, do these steps.
C
For release with the ground reconditioned air connection check valve inoperative in the open position, do these steps.
答案解析
正确答案：B
相关知识点：
单向阀不工作时放行飞机步
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