A.the affected individual never worked with any carcinogenic material
B.the cancer was actually caused by a long ago exposure
C.the size of the cluster is too small to be meaningful
D.the cancer actually arose in a different geographic location
第5题
A.细胞膜,细胞壁,核质,芽胞等
B.细胞质,细胞膜,细胞壁,核质等
C.核质,鞭毛,细胞膜,细胞壁等
D.细胞壁,细胞质,荚膜,核质等
E.细胞质,细胞膜,细胞壁,核仁等
第8题
A.肽聚糖、磷壁酸、脂多糖、核膜
B.核膜、细胞膜、细胞壁、线粒体
C.细胞壁、细胞膜、细胞质、核质
D.鞭毛、菌毛、芽胞、荚膜
E.质粒、鞭毛、细胞壁、肽聚糖
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