What does a reference group do?
A.Its members know each other very well.
B.Members of the group influence each other.
C.All members like the same thing.
第4题
下列关于Kaposi肉瘤的描述,正确的是
A.来源于纤维组织的恶性肿瘤
B.仅累及皮肤
C.肿瘤边界清楚
D.是由梭形细胞和血管构成的恶性肿瘤
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