题目内容（请给出正确答案）

[单选题]

Before starting the engine the air bottle should be（）

A.pumped up

B.loaded

C.discharged

D.opened

提问人：网友lixin080108 发布时间：2022-02-13

参考答案

A、pumped up

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· 有5位网友选择 B，占比50%
· 有3位网友选择 C，占比30%
· 有2位网友选择 D，占比20%

ABCD

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