皮皮学，免费搜题
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【多选题】
空间直线相对于投影面的位置,分为:
A.
投影面的垂直线
B.
投影面的平行线
C.
一般位置线
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
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皮皮学刷刷变学霸
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B.
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C.
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