问题描述：
[单选]
（汉译英）确保单向阀上的箭头远离接地供气管。
A．Make sure that the arrow on the check valve is distant from the ground air supply line.
B．Make sure that the arrow on the relief valve stays away from the ground air supply line.
C．Make sure that the arrow on the check valve points away from the ground air supply duct.
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答案解析：无
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