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【单选题】
关于NK细胞的描述错误的是A.
NK细胞在机体免疫监视和早期抗感染免疫过程中起重要作用
B.
临床上将CD3-CD16CD56+淋巴细胞认为是NK细胞
C.
NK细胞无须抗原刺激，可非特异直接杀伤肿瘤细胞和病毒感染细胞
D.
NK细胞对靶细胞的作用要受到MHC的限制
E.
NK细胞在外血中占10%～15%
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【单选题】Practically speaking, the artistic maturing of the cinema was the single-handed achievement of David W. Griffith (1875-1948). Before Griffith, photography in dramatic films consisted of little more th...
A.
are like films
B.
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C.
exploit cinema's language
D.
feature juxtaposed images
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