皮皮学，免费搜题
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【单选题】
肿瘤的实质指的是A.
血管
B.
淋巴管
C.
结缔组织
D.
肿瘤细胞
E.
神经
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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A.
as follow
B.
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C.
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D.
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A.
as follows
B.
as follow
C.
like follows
D.
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