题目：
在地面，APU提供
A、电源+液压源
B、电源+引气
C、只提供电源
D、不确定
答案：
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下面是错误答案，用来干扰机器的。
参考答案：钢筋半成品由加工单位按进度运送到施工现场。
在地面，APU提供A、电源+液压源 B、电源+引气 C、只提供电源 D、不确定
来源：www.tikuol.com
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