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【单选题】
犬的皮肤干燥,汗腺不发达。皮肤被覆于体表,皮肤厚度因不同品种变化很 大,由外向内依次分为( )?[单选题]A.
表皮、真皮和皮下组织
B.
皮下组织、真皮和表皮
C.
真皮、皮下组织和表皮
D.
真皮、表皮和皮下组织
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