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单选题

Make sure that the arrow on the check valve points away from the ground supply duct.

AA. 确保单向活门上的箭头指向远离地面供气管方向。

BB. 确保关断阀门上的箭头指向远离地面供应弯管方向。

CC. 确保调节阀门上的箭头指向偏离地面供应通道方向。

正确答案:A (备注:此答案有误)

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