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单选题
156.哪个系统有手摇泵? Which system has a hand pump?
A
绿系统和黄系统 blue system and yellow system
B
蓝系统 blue system
C
黄系统 yellow system
答案解析
正确答案：A
解析：
哪个系统有手摇泵? Which system has a hand pump? 答案: A - 绿系统和黄系统 (Green system and yellow system)
解析：这道题目问哪个系统有手摇泵，正确答案是绿系统和黄系统。所以选项 A 是正确的，而选项 B 和 C 分别只提到了单独的蓝系统和黄系统，没有涵盖正确的答案。
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