皮皮学，免费搜题
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搜题
【单选题】
既有机车或回转车车钩距轨面高度为( )，采用15号车钩。A.
800 mm
B.
880 mm
C.
900 mm
D.
920 mm
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】HTML DOM中的根节点是（）。
A.
B.
C.
D.
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